During a full moon, people are quirky. But a full moon on Friday the 13th means everything's game, and Madrona Bay Hospital's patient relations manager, Robyn Kelly, knows it. Still, she is unprepared for finding patient Jason Hilliard strangled with IV tubing in his hospital bed.Now, she's got a hospital in panic, a police investigation going awry, and anonymous letters that promise more trouble to come. Not to mention her college-age son announcing a "mercy" trip to Africa, her dining room ceiling collapsing, and her friend, Det. Matthew Pierce, in traction.Then police Captain Roberts announces that he's making an arrest by Friday. Robyn finds herself once again in the cross hairs and completely over her head. Can she put together the clues in time to save herself? Or will Robyn end up with nothing but dirty laundry?