Grandchester Mystery Mansion

Grandchester Mystery Mansion is a haunted house exhibition in Nuka-World in 2287 where presumably Lucy Grandchester became possessed and murdered her parents, then committed suicide shortly after her 18th birthday. Currently, the house is quite booby trapped and is being used by Zachariah.

The house is locked, but entry can be obtained from the Protectron working just outside the front entrance. The player can either buy a ticket, pick a ticket up off the ground by the Protectron's feet and present it to the Protectron, pickpocket the key off the Protectron or destroy the Protectron and loot its corpse.

Layout
This large building features several accessible floors. The tour of the building is linear, often locking the player in until the automated announcer finishes describing the current room. The tour moves through the main floor, right until the kitchen. In the kitchen is a master locked door that leads to the basement. Inside the basement is a novice locked door with a bloody scene containing six trader corpses.

From the main hall and from the kitchen are three stairs going to the second floor. The doors on the second floor accessible from the main room are all locked and need a key (and are opened later as part of the tour). The door accessible through the kitchen is unlocked as it is part of the tour. The hallway upstairs is protected by an automatic turret.

The second floor has several chambers, the first one is rigged with gas and was used for seances. The gas can be turned of by using the terminal in the back left corner. The next hallway ends with dead end stairs, and the bedroom of the child on the left. Adjacent to the child's bedroom lies the parents' bedroom, currently in use by Zachariah.

Haunting
There are several encounters with a child that can't be targeted in VATS:
 * Before entering for the house for first time, staring through a window to the top right above the entrance. If you fly up to that room, you'll see that the only door to that room is boarded up from the inside.  The child never notices the player.
 * When the player enters the house for the very first time, on the second story running to the left.
 * In Zachariah's room is a master locked door that leads to the attic. Entering the attic spawns the same child who runs left. The child will run through a door on the back left wall shortly after spawning.  If the player opens the door, a loud, jarring sound will be heard and one will find a dead end.
 * On the terminal in Zachariah's room, he mentions in his last journal entry that he thinks one of his bots is malfunctioning because he keeps inexplicably hearing a child's laughter.
 * You may encounter a glitch where the girl runs past you on the upstairs hall. It is possible to chase her through the kitchen to the "upside-down room", where she will stop. You can engage her with the "talk" option, but she will not reply, only stare at you with a creepy expression. You will notice she has a rope tied several times around her waist, presumably referring to her death by hanging.

Trivia
The Grandchester Mystery Mansion is most likely based on the Winchester Mystery House, due to its similarity with supposed hauntings, seances and strange architecture meant to confuse spirits, such as doors and stairs to nowhere, etc.

Notable loot

 * SCAV! Issue #4 (+5% explosives damage). On a wooden box in the attic storage/workshop.
 * Nuka-Punch recipe book in the room with Zachariah.
 * A Protectron model in the basement, behind a master locked door. After entering the room, it stands on the right on a tool board.
 * A mini nuke on the top floor, just behind the steamer trunk.

Appearances
Grandchester Mystery Mansion appears only in the Fallout 4 add-on Nuka-World.