Chief Inspector Cathy Hyde works with the police to break up a suspected puppy-trafficking ring in Lancashire and is dismayed to discover that some of the dogs are suffering from a deadly virus. In Birmingham, Herchy Boal tries to persuade Jason to give up his beloved huskies after complaints from his neighbours, while Clare Dew heads for north London after receiving a call about a Maltese-terrier cross on the roof of a takeaway shop on a busy main road.