The Mystery Shack

The Mystery Shack is the main headquarters for the Investigators in Arkham, Massachusetts.

Acquisition
The Mystery Shack was left to Doctor Cillian Davy and Mother Rosemary after their ordeal with Mister Kimble - a scholar who willingly became a ghoul.

Kimble asked the two to keep his secret of his new existence, and let people believe he had moved away, giving them the deed to the house as a thank you for leaving him be. It has since become the Investigator's base of operations, and a place known to go to should someone wish to contact the group, considering how wide spread (and sometimes inaccessible) across Arkham they are.

Artefacts kept within
The Shard of Leviathan, Tome II - Sealed in an Elder Signed box and stored in a locked safe within the Attic, which remains locked. Mother Rosemary currently has the key to the safe, and Doctor Cillian Davy has the key to the attic, and the key to the Elder Signed box.

Inhabitants
Doctor Cillian Davy - Lives in the Mystery Shack full time, as its Guardian, and to receive messages and guests while active investigators are not present

Clifford Underwood - Had a spare room in the Mystery Shack for whenever he wished to stay, late night visits, and research ventures

Mother Rosemary - Has a spare room in the Mystery Shack, separated from the others for her modesty, for the times she doesn't make the trip down Lich Street to Saint Raphael's.

Fitzroy - A black cat that Doctor Cillian Davy found as a stray outside Miskatonic University and took in