Someone is breaking into houses in Kristy and Abby's neighborhood. Meanwhile, Mallory is struggling to help a woman who has suddenly appeared in town with no identification and no memory. In New York City Stacey and Claudia are being followed. And someone is leaving very odd, unsettling gifts and Stacey's door.

The Christmas season takes on a spooky feeling when the members of the Baby-sitters Club become tangled up in a string of mysterious events.

Fearing that someone is stalking them after a series of dangerous accidents, the Baby-sitters escape for a skiing weekend but become petrified when the trouble follows them and points to someone from their past.

“Erin Kelly is a seriously good writer, and this gripping novel is her best yet.” —Sophie Hannah, author of Kind of Cruel A stand-out author of deeply atmospheric psychological thrillers, Erin Kelly is on her way to joining the bestselling ranks of Kate Atkinson and Barbara Vine. Until now, the MacBride family has led a cozy life of upper-class privilege: good looks; tuition-free education at the prestigious private school where their father, Rowan, is headmaster; an altruistic righteousness inherited from their mother, magistrate Lydia. But when the MacBrides gather for the first time since Lydia’s passing at their restored barn in the secluded countryside, the family discovers a stranger in their midst: a stranger who is convinced that Lydia was a murderer—and who has been plotting a spectacular revenge that may shatter their world forever.

THE INSTANT NEW YORK TIMES BESTSELLER “Looking for a suspense novel that will keep you up until way past midnight? Look no further than Lock Every Door, by Riley Sager.”—Stephen King No visitors. No nights spent elsewhere. No disturbing the rich and famous residents. These are the rules for Jules Larsen’s new job apartment sitting at the Bartholomew, one of Manhattan’s most high-profile buildings. Recently heartbroken—and just plain broke—Jules is taken in by the splendor and accepts the terms, ready to leave her past life behind. As she gets to know the occupants and staff, Jules is drawn to fellow apartment sitter Ingrid, who reminds her so much of the sister she lost eight years ago. When Ingrid confides that the Bartholomew has a dark history hidden beneath its gleaming façade, Jules brushes it off as a harmless ghost story—until the next day when Ingrid seemingly vanishes. Searching for the truth, Jules digs deeper into the Bartholomew’s sordid past. But by uncovering the secrets within its walls, Jules exposes herself to untold terrors. Because once you’re in, the Bartholomew doesn’t want you to leave....

There’s someone out there, someone who kills on Valentine’s Day. Josie and Melissa are scared, especially when they receive threatening valentines. Then the murders begin. Who is sending these horrible valentines to the girls of Shadyside High? And who will be the next to die?