Following a personal tragedy, florist Persimmon 'Simmy' Brown has moved to the beautiful region of the Lake District to be nearer her charismatic parents. Things are going well, with her latest flower arrangements praised and Simmy content 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 florist of the wedding 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 - an uncaring mother, a cheating father, and a husband twenty-five years older than his bride. When events take another sinister turn, Simmy becomes a prime witness and finds herself at the heart of a murder investigation.

The chief suspects are the groom and his closely knit band of bachelor friends. They are all intimidating, volatile and secretive - but which one is a killer?