Suspects - Season 1 Episode 3

Martha and her team investigate when a woman is raped by the West Willow canal. There have been two other recent assaults in the area and in each case the women were grabbed from behind by an attacker wearing a balaclava helmet and gloves. The immediate suspect is George Callaghan, a rapist recently released from prison, but the CCTV installed at his house after his release and his girlfriend Annette corroborate that he was at home at the time. The latest victim is Diane Ackerman, whose husband Howard is a chief superintendent at the station. The Ackermans have recently separated and the police were called to the house when Ackerman hit Diane, who has since changed all the locks. Diane was drinking in a bar just before she was attacked so her rapist could have spotted her there but Ackerman himself has no alibi, making the investigation particularly difficult for the team.