Lock Every Door by Riley Sager

Started: 7/23/19
Finished: 1/17/20
Year: 2019
Pages: 368
Genre: Mystery
Grade: C
Reason for reading: Goodreads.com giveaway
Blurb (from book jacket): "These are the only rules for Jules Larsen's new job as an apartment sitter at the Bartholomew, one of Manhattan's most glamorous and secretive buildings. Recently heartbroken and just plan broke, Jules is captivated by the splendor of her surrounding and accepts the terms, ready to leave her past life behind.
"As she gets to know the residents and staff of the Bartholomew, Jules finds herself drawn to fellow apartment sitter Ingrid, who comfortingly reminds her of her sister who vanished eight years ago. When Ingrid confides that the Bartholomew is not what it seems and that the dark history hidden beneath its flaming facade is starting to frighten her, Jules brushes it off as a harmless ghost story...until the next day, when Ingrid disappears.
"Searching for the truth about Ingrid's disappearance, Jules digs deeper into the Bartholomew's sordid past and the mysteries kept within its walls. What she discovers pits Jules against the clock as she races to unmask a killer, expose the building's hidden secrets and escape a dream apartment that has quickly turned into a nightmare."
Opinion: An interesting premise-apartment sitter in one of Manhattan's magnificent apartment buildings. The rules are slightly strange but nothing that can't be followed. But then it just takes a very odd turn. A turn that I felt was ridiculous and turned the book into what could have been a B or an A book into a C.