Cycle courier Astrid Bell is bad luck - for other people. First Astrid's neighbour Peggy accidentally knocks her off her bike - and not long after is found bludgeoned to death in an alley. Then a few days later, Astrid is asked to pick up a package - only to find the client slashed to pieces in the hall of her own home.

For the police it's more than coincidence. For Astrid and her six housemates it's just the beginning of a nightmare - the growing suspicion that the worst is yet to come.

Because if it's true that bad luck comes in threes - who will be next to die?