Harry H Corbett plays a tycoon husband Harry Fender, who has built up the supermarket business from the time he was a delivery boy in his teens - he's now over forty and obsessed with developing the exotic plants in his hothouse.

Michael and Jo Richardson are celebrating their wedding anniversary at a secluded country cottage. Jo discovers the body of their friend Edward Fellowes in the bedroom and call Dr Clarkson but find his behaviour very strange.