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The Bisons, a secret society similar to the Freemasons, is holding its meeting at Woodcote Park. Large amounts of alcohol are consumed. On the way home, one of the Bisons, Derek Donaghue, is stopped for drink-driving.

Helen asks Rocky to take some of her chairs to sell at an antique shop. Roxanne, the shop assistant, realises that he knows nothing about antiques and rips him off. He and Helen come up with a plan to get his own back. He invites Roxanne for a slap-up dinner at Woodcote, then disappears while pretending to book them a room for the night. Helen makes Roxanne pay the bill!

Ken receives a peremptory phone call to meet a potential client, Vincent Brack. Brack wants Ken to watch his wife, Nina. Ken follows Nina to a pub where she changes into a tarty dress and blonde wig, and leaves without Ken realising. The following day he is ready for her and follows her to a club where he discovers that she works as a hostess and singer, using the name Susie. Suspecting the worst, Ken gets chatting to her but she vehemently denies being a prostitute: "I don't do tricks," she protests, "That's not my department." She explains that she is desperately unhappy and that her husband regularly beats her up, thinking she is having an affair.

When Ken and Harry compare notes, they find that Vincent is a member of the Bisons, as well as being a policeman in the Vice Squad. After watching him they realise that he is tempting his fellow Bisons to get drunk and then tipping the police off so they will be caught as they drive home: he seems to be more concerned with making sure that they will be caught than with stopping them driving in the first place.

Ken confronts Nina, revealing that Vincent has hired him but that he is on her side. Nina tells him that she and Vincent once had a daughter but she was killed by a drunk driver - this explains Vincent's vindictive attitude to drunks. Nina also suspects that Vincent is corruptly accepting money from the club's owner, Laker, in exchange for protecting the club from Vice Squad raids.

Ken and Harry present evidence of Vincent's habits to the police; consequently he will be dismissed from the force and may face criminal charges. Nina decides to leave Vincent and return to London. Ken goes to the railway station and begs her to stay, but she refuses.
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