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Strike visits several London strip clubs in order to find out more about one of the murder suspects, Niall Brockbank.

Robin's relationship with Matthew has hit a low point, and she questions her commitment to marriage. Her mother arrives in London to talk her round, convincing Robin to spend some time at home in Masham.

Strike begins to narrow his list of suspicions - but, according to an angry Wardle, his investigating is 'meddling' with police business.

The killer continues to taunt them, with Matthew finding a severed human thumb in the kettle. Robin returns to comfort Matthew and provides Strike with Brockbank's address.

Without Strike's knowledge Robin allies herself with Shanker, paying him to take her to Brockbank's home to question his girlfriend Alyssa - inadvertently putting herself in danger.