Nightmare in the Sanitarium (BRP)
After a fevered dream the players wake up in a windowless sanatorium room¸ they will have to work together to get out but one of them has other projects. Find out about the traitor before it's too late and escape or get lost in the sanatorium forever.
This was a One-shot (For 3 to 5 player (better in 4+)) i've wrote for Halloween years ago¸ some homebrew rules were necessary to make it work since this isn't a canonical Call of Cthulhu adventure but more an escape room with a guess whos the traitor component.
Notice: Updated with a good translation