When Grace can't get hold of Nelly, she reaches out to an old acquaintance to help escape the Towers. But an encounter with Samson brings the wrath of Zita.
A police recording of a distressed 999 call made by Jody is traced to an area in south London. Nelly finds his own unique way of finding where Jody was held in Streatham.
Grace's memories of the previous night suggest someone else was at the scene of the crime. Nelly aims to hunt down the suspect, but his mission is derailed.