Rewind / Catherine Ryan Howard.

"PLAY: Andrew, the manager of Shanamore Holiday Cottages, watches his only guest via a hidden camera in her room. One night the unthinkable happens: a shadowy figure emerges onscreen, kills her and destroys the camera. But who is the murderer? How did they know about the camera? And how will Andrew live with himself?... PAUSE: Natalie wishes she'd stayed at home as soon as she arrives in the wintry isolation of Shanamore. There's something creepy about the manager. She wants to leave, but she can't - not until she's found what she's looking for... REWIND: This is an explosive story about a murder caught on camera. You've already missed the start. To get the full picture you must rewind the tape and play it through to the end, no matter how shocking..."--Publisher description.