At the Magistrates Court, the renewal of a gaming licence for the Carrington Club run by Dick Vaughan, is postponed pending further enquiries after a punter in the public gallery alleges that he was cheated by Vaughan. Vaughan does not realise that the ""punter"" is really Rupert Cole, who runs a rival gambling club. Vaughan gets Ken to investigate - if any of his croupiers are cheating, he wants to know before the Gaming Board investigators call on him. Ken spends the evening at the Carrington but sees nothing unusual so he asks Helen to come with him the following night. She soon notices that Jackie, one of the blackjack croupiers, is cheating. Ken pretends to be a writer, researching a university psychology textbook on gambling, in order to gain Jackie's confidence. He challenges her and she admits that she has been persuaded by Cole to cheat and to make sure that she is caught, so that the Carrington will be blamed and will lose its gaming licence. Ken has one of his famous conflicts