Everything's coming up roses for garda Siobhán and the rest of O'Sullivan family in quaint Kilbane, County Cork, Ireland—until a murder investigation blooms out of a deadly gardening competition.

While Siobhán studies for her Detective Sargeant exams, her brother, Eoin, prepares for the grand opening of his new restaurant, The O'Sullivan Six, and concocts a plan to enter Kilbane's Top Garden Contest to boost business. But trouble brews when Eoin hires a mercurial landscape designer known for her killer designs. His new partner's unflattering reputation and questionable practices nearly eclipse her talents—and plunge the prestigious competition into chaos.

A lush and intricate winning garden emerges from the controversy, with a spectacular golden statue in the center of the display. But in a devastating twist, the work of art leads to the shocking discovery of a bold and brutal work of murder.

Everyone in town has an opinion about who committed the crime and planted the evidence, from easily bribed sponsors to green-with-envy gardeners. And with another golden statue found in Eoin's garden display, rumors about his involvement intensify. As local gossip buzzes and a list of suspects grows, it's up to quick-witted Siobhán and her husband, Macdara, to suss out the guilty culprit's identity ... before the competition buries another victim.