Coffins that send up aerials after they are buried, a hospital that gets distinctly non-botanical deliveries from the local florist, and a delightfully eccentric old train driver with his own miniature railway are part of the mysteries that Steed and Mrs Peel must unravel as they tackle a case in which the radar system at a missile early warning station is inexplicably jammed. When the station's brilliant radar scientist Dr Hubert Marlow dies and appears to be buried but is seen alive at the hospital shortly afterwards, Mrs Peel signs on as a trainee nurse to see what is going on in the hospital. Meanwhile, Steed discovers that the old railwayman is a bit too ready to donate his wealth to worthy causes.