Newlyweds Penny and Tom Gilbert are entertaining Tom's colleague James and his wife Alice to dinner, when they are unexpectedly interrupted by Harry Barton, a character from Tom's past. Harry has come to offer Tom a job; not so surprising perhaps, as Tom is known to be a high flyer in his work with computers. But why should Tom be so alarmed at Harry's offer? What gives Harry the power to threaten Tom if he refuses? And what exactly is the "past" which Tom tries desperately to evade? This tense drama builds to an unusual - and unguessable - twist in the tail!