Lock Every Door

In "Lock Every Door," by Riley Sager, recently heartbroken Jules Larsen takes a job apartment sitting at the exclusive Bartholomew in Manhattan, enticed by its luxury but bound by strict rules. As she becomes acquainted with the eccentric residents and staff, she forms a connection with fellow sitter Ingrid, who warns her about the building's dark history. When Ingrid suddenly disappears, Jules embarks on a quest to uncover the Bartholomew's hidden secrets, putting herself in grave danger as she realizes the building's intentions may not be as benign as they seem.