You are cordially invited to die. Former serial killer Carol Quinn is about to get out of prison (again) in time to attend the wedding of fellow retirees Geoffrey and Catherine on a remote island off the Suffolk coast. When the bride's horrendous ex-husband is found murdered hours before the ceremony, however, matrimony soon turns into mayhem. Thanks to her ankle monitor Carol is exempt from suspicion, but that is little comfort to the other guests, who now realise that there is more than one murderer in their midst. In an unexpected turn of events, the charmingly hapless (and only police officer on the island) Detective Constable Ryan Fleet insists that the wedding go ahead as planned, if only to keep all the suspects in one place. Inviting a killer to your wedding is a risk - inviting two killers is a death wish. Luckily for Carol, the only thing she's better at than murder is solving one. She'll put this rival in their place, even if it kills her.