Laura has left CBS: according to Rocky this is because she felt that Harry was taking her for granted. Charlie Hardiman is having to answer the phone and act as secretary. Harry is desperate to find a permanent replacement but all the girls that he has interviewed so far are proving to be singularly useless.

Robert MacGuffin, a hardware designer who works for a computer company, Pictel, believes that his former secretary, Alexandra Wilton, is stealing the design for the company's latest transputer. He wants Ken and Harry to watch her. He suspects her of industrial espionage because she has just resigned for no apparent reason (or so he says) and she already has a prison record for cheque fraud. Ken and Rocky set up their cameras and binoculars in a disused warehouse opposite the studio flat where she lives. Rocky follows Alex to the ice rink where she meets her boyfriend, Jim Parham.

When Ken sees a middle-aged man arrive at Alex's flat and offer her a cheque which she refuses, he trie