Mrs Van Bueren, a middle-aged widow, arrives home to find that she has been burgled. Fortunately the thieves have not taken her jewels. She enlists Ken's help to guard them. Ken takes away the jewellery box, full of tiaras and necklaces, to store it in CBS' safe. Meanwhile, Mr Fraser, a rep from a security firm, is showing Harry his company's products - a mugger-proof briefcase and a safe alar. Harry is not impressed and sends Fraser away with a flea in his ear... but not before he has seen Mrs Van Bueren's jewellery. Rocky is behaving very strangely: his heart isn't in his work any more and he hasn't turned up for work. He has started wearing aftershave and he has bought a clapped-out Ford Capri with a musical horn and a noisy exhaust. All this is because he has fallen madly in love with Melanie King, a demure cashier at his bank. Harry has noticed that Rocky isn't really concentrating and is ""on another planet"", so he gives him an easy job: guarding a sculpture exhibition consisting
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