Deus Ex 9th Mission: Paris Streets and Chateau DuClare

The 9th mission in Deus Ex is principally set in Paris (specifically, the Denfert-Rochereau square, the Catacombs, and Champs-Élysées) and also features a visit to the Chateau DuClare. In this mission, JC Denton arrives in Paris to find Nicolette DuClare, who may be able to help JC contact Morgan Everett.

Goals

 * *If Jaime was told to stay in UNATCO

Augmentation canisters

 * Chateau DuClare
 * Aggressive Defense System / Spy Drone (appearance #3) – In Beth DuClare's secret computer room in the basement, in a locked container (code 1784) that can also be opened by a security terminal
 * Augmentation upgrade canister – Same location as above

Weapon modifications

 * Denfert-Rochereau
 * Recoil – Sold by Defoe in the subway station (1200 credits / 400 credits after the discount)
 * Catacombs
 * Reload – In a locked box in bunker 3, just after the entrance to the bunker
 * Scope – Carried by Mari Hela, the Woman in Black in bunker 3 (must be rendered unconscious rather than killed)
 * Near Champs-Elysées
 * Reload – Carried by a police officer guarding the building across from Tres Ch!c
 * Scope – Carried by an MJ12 Trooper near the metro
 * Accuracy – Inside building #11 (arms smuggler's flat)
 * Range – Inside building #11 (arms smuggler's flat)
 * Clip – Inside building #11, in a locked container
 * Laser – Inside building #11, in the same locked container as above
 * Chateau DuClare
 * Clip – In Nicolette's room, in a secret compartment opened by interacting with the skull on the fireplace
 * Reload – In Beth's room, behind the painting
 * Accuracy – In Beth's secret computer room, on a table near the computer

Denfert-Rochereau
You begin on the roof of an abandoned building. There are two options downward: jump down the empty elevator shaft, or take the working elevator, which is locked by a keypad (code 4003). If you use the empty elevator shaft, exit at the first opening (which is where the working elevator would have taken you). Head upstairs to find an old woman, Aimee. She will assign you a new secondary goal of killing four greasels that live in the sewers below the building. She will also give you the code 0001 for the door to the radioactive room leading to the sewers.

Continue to the bottom floor to find the entrance to the radioactive room. Open it using the above code. If you have Regeneration upgraded to the second level or higher, it can be used to fully counteract the radiation damage. If you do not wish to trek across the entirety of the radioactive room, there is an alternate path below the elevator shaft of the working elevator that gets you closer to the room's exit.

Pass through the radioactive room and drop into the sewers, where you will be contacted by Icarus for the first time. While optional, if you kill all four greasels in the sewers and report back to Aimee, you will receive 200 SP.

Continue in the sewers to find the exit to the streets. The Denfert-Rochereau streets include two notable side features: To enter the catacombs, you may open the locked front door (whose key is carried by one of the MJ12 commandos patrolling the streets) or destroy the wooden boards on the back entrance. Inside the catacomb building, there is a datacube with a useful map of the catacombs. Step into the spiral stairs to enter the catacombs.
 * The arms dealer Defoe can be encountered in the metro station. If you ask him why his prices are high, he will give you a secondary goal of clearing out the MJ12 troops in the station. If you complete this task, you will receive a significant discount on his prices. Note that in the Game of the Year Edition, there are only two troopers that you need to kill, even though the mission goal states that there are three.
 * Next to the metro station is a building in use by MJ12. The building includes minor loot. One of the offices contain a cabinet with the key to the basement warehouse, where a repair bot can be found.

Catacombs
The Catacombs are best navigated with the assistance of the above mentioned map or the annotated version of the map provided by this article. Proceed until you reach a dead end where there are two movable bricks. Activating either brick will open the door to the Silhouette hideout. Speak with Chad, the Silhouette leader. Chad has information on the whereabouts of Nicolette DuClare, but he wants to you rescue Silhouette members captured by MJ12 in order to be certain of your loyalties. Chad will provide you with the NanoKey to travel further into the Catacombs, as well as another copy of the map of the catacombs.

Use the NanoKey to open the blast door directly across from the Silhouette hideout's entrance. The goal is to reach Bunker 3, the bunker occupied by MJ12. Along the way, where you can encounter a bum in Bunker 2 who sells Tranquilizer Darts and Medkits. Closer to the entrance to Bunker 3, there is a room to the south with a ladder that leads to a storage area with a repair bot. If you release the repair bot, it will automatically repair the electrical hazard nearby.

Upon entering Bunker 3, look to the left to find a locked box with a reload modification inside. Also in this area is an underwater passage to the back of the bunker. At the back of the bunker, you will find Mari Hela (the Woman in Black in charge of MJ12's catacombs operation) and a table with the sewers NanoKey. Once you have this NanoKey, you may proceed directly to the next phase of the mission by opening the door to the sewers. However, completing the secondary goals pertaining to rescuing the hostages will earn you substantial skill points.

The hostages are found in the locked room of the center of the oval-like structure. If both hostages make it back alive, you will earn the 500 skill points reward when you report back to Chad. When you report back to Chad, he will tell you to look for Nicolette at the Club La Porte de l'Enfer, located in a part of Paris accessible through the sewers to the northwest. He will also give you the sewers NanoKey, if you did not pick it up from Bunker 3.

Using the sewers NanoKey, open the locked door that allows you to access the northwest part of the catacombs. Continue to the part of the catacombs labeled on the map as "to sewer tunnels" to reach the next area.

Near Champs-Elysées
From the sewers, there are two manholes that provide access to the streets, one unlocked and one locked. The unlocked manhole exits at a position where you will likely be exposed to a great number of MJ12 troops guarding the streets. On the other hand, the unlocked manhole exits at a relatively safe position away from the MJ12 troops.

Champs-Elysées is heavily guarded, but otherwise serves as a city hub. Note that only a handful of buildings have accessible interiors. Notable side locations are listed below. Your eventual destination is La Porte de l'Enfer. To enter the nightclub, you may pay the doorman 300 credits or steal the key in his office by entering the office through a vent accessible from the back entrance. Speak to a young woman upstairs, who tells you to meet Nicolette outside the nightclub. Note that La Porte de l'Enfer has a storeroom (code 1966) with minor loot. Entering the storeroom will result in a reward of 50 SP.
 * Near the sewer exits is a street station in use by MJ12. Entering the station will result in a reward of 50 SP.
 * If you told Jaime Reyes to stay at UNATCO during your escape from the headquarters, you will have a secondary goal of meeting him at the Enfant Terrible cafe (building #19). Reyes will give you the kill phrase of Gunther Hermann. If you told Reyes to go to Hong Kong, he will not appear in Paris.
 * In Aucun Dites Motel (building #10), you may find a man named Renault who will ask you to find Zyme in the Boulangerie Centrale bakery. This task will be added as a secondary goal. Finding the location in the bakery where the Zyme is stored will grant a skill point bonus.
 * There are two apartments in the area (buildings #11 and #12).
 * Building #11 belongs to O and Rene. Visit the balcony to receive a bonus of 50 SP.
 * Building #12 belongs to an arms smuggler, possibly Defoe who was encountered at the Denfert-Rochereau metro station. The apartment contains four weapon modifications.
 * Finally, there is a digital media store (building #14). Trace Tong tells that that there is nothing worthwhile inside. However, you can pick up a 50 SP bonus by breaking in.

Outside the nightclub, meet Nicolette, who agrees to help you contact Morgan Everett. She tells you that you will need to search her mother's home for clues on how to contact Everett. Talk to Jock to proceed to the next area. After you leave for the Chateau, you will not be able to return to the prior areas of this mission.

Chateau DuClare
The Chateau was the home of prominent Illuminati member Elizabeth DuClare. Nicolette has not been here since her mother's assassination several months ago. The front doors are locked, but there is a boarded-up rear entrance that can be entered by breaking the wooden planks.

Once inside, go to the south side of the Chateau and take the stairs up. On the second floor, find a lamp with a vase nearby. As hinted by Nicolette, the key to Beth's bedroom is by the lamp and vase. Use the key to enter Beth's bedroom. There, open the painting to find the basement key in a hidden compartment. Before heading to the basement, pick up the key to Nicolette's bedroom on a bookshelf. If you enter Nicolette's bedroom, activate a skull switch to find a hidden compartment. Head downstairs to the kitchen and find a downward passage to the basement (wine cellar) on the left side. Continue until you find a candelabra, which opens a secret passage to Beth's computer room. This room contains a variety of valuable loot, including an augmentation upgrade canisters in a locked case (code 1784). Your ultimate objective is to access Beth's computer (bduclare/nico_angel) to send a message to Everett.

Everett agrees to meet you, but first you must help Everett by accessing a computer system in the Knights Templar Cathedral. Everett instructs you to leave the Chateau via a passage in the crypt maze, which is located at the rear of the estate. Nicolette will not accompany you into the crypt maze. Find and enter the passage to complete the mission. Note that MJ12 commandos are patrolling the crypt maze.