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