A murder mystery with a twist... we know who the murderer is, but who is the victim?

As reporter Grace investigates the killing of a cyclist, memories of another murder begin to possess her - the murder she committed…

Trying to comes to terms with the crime she believes she has got away with, Grace starts writing her confession. In this twisty-turny domestic thriller, we find out the reasons for the crime of passion that took place on Grace’s wedding day. How each one of four possible victims pushed Grace to her limits, before she pushes one of them to his (or is it “her”?) death from the luxury cruiser where the wedding reception is being held.

Meanwhile, in the peaceful Surrey town where Grace works as a newspaper reporter, there are some strange goings on. Cats go missing, a cyclist dies, and it looks like these events could be connected to an old lady who befriends Grace, called Iris. Could there be two murderesses living within a few streets of each other?