A young Czech girl, missing for eight days, is found abandoned in a deserted playground. She is so traumatised she cannot speak.
DCI Eve Clay is on her way to try and interview the victim, when another case is called in. Two Polish migrant workers have been found dead in their burnt out flat. But this is no normal house fire. The men's bodies were set alight, after the killer had clinically removed both of their hearts.
Then reports come in that the Czech girl's mother has disappeared.
Then Clay and her team receive an anonymous call. Somone else will die before the day ends.