Following a personal tragedy, florist Persimmon "Simmy" Brown has moved to the beautiful Lake District region to be closer to her charismatic parents. Things are going well, and Simmy is happy to lose herself in her work. But the peace she has found is shattered when, at the wedding of a millionaire's daughter, the bride's brother is found brutally murdered in the lake.

As the wedding florist and one of the last people to talk to Mark Baxter alive, Simmy gradually becomes involved with the grief-ridden and angry relatives. All seem to have their fair share of secrets and scandals—a distant mother, a cheating father, and a husband twenty-five years older than his bride. When events take another sinister turn, all eyes turn to the groom and his close-knit friends, each more secretive and volatile than the next. As a prime witness, Simmy finds herself at the heart of a murder investigation that could undo a family and a whole town …