Lock Every Door Novel by Riley Sager

"Lock Every Door" follows the story of Jules Larsen, who takes a job as an apartment sitter in a luxurious and mysterious building in Manhattan. As she settles into her new role, she discovers dark secrets about the building's history and its eccentric residents. The suspense builds as Jules unravels a sinister conspiracy that puts her own life at risk, making the novel a gripping psychological thriller with unexpected twists and turns.