Whilst out on a rowboat with her husband, John, Louise Haloran kills him, and casts his body overboard, telling the family he left on an urgent business trip. Louise's main concern; she can only inherit part of his family fortune if he's still alive. The Halorans are a strange family; still grieving over the death of the youngest daughter, Kathleen who'd drowned in a pond when she was a young child. The family hold an annual ceremony of remembrance, on the anniversary of her death. But this year – with John recently deceased, someone is wielding an axe…intent on murder!