The town of Shamrock Cove is gearing up for a grand summer festival... but the fête turns fatal when a clockmaker is killed. Can amateur sleuth Mercy McCarthy crack the case? When Mercy McCarthy takes her beloved mother's watch to be fixed, she's completely charmed by the little repair store and the father-and-son duo who run it. Little does she know that the clock is ticking... when she returns, she finds the father lying unconscious amid broken glass, and her mother's watch is missing. The police think Mr. Flynn was attacked in a burglary gone wrong but soon suspects closer to home start coming out of the clockwork. Mercy, her sister, and their canine sidekick, master body sniffer-outer Mr. Poe, set out to gather clues and help the local detective find the killer. Could it be the family next door to the Flynns who've been feuding for decades? His fiercest rival, who's long dreamed of shutting him down? Or was his son less devoted than he seemed? As the hours tick away, another murder and the discovery of a long-buried secret changes everything...