Bec and Izzy have been best friends their whole lives. They've been through a lot together - the death of Bec's mother, the birth of Izzy's daughter, Bec's engagement. But there's a darker side to their friendship, too - and Bec is about to reach breaking point. Then Izzy is found broken and bloodied at the bottom of the stairs. It could have been an accident - perhaps she fell - but if the police decide to look for a killer, then Bec is sure to be their prime suspect.