This is the story of what appears to be a normal situation but insidiously proves to be something different and much darker. Caroline Marshall is married to Clive, a successful bank manager. Their only son has left for Cambridge and, for dutiful Caroline, time hangs rather heavily, her days spent visiting her aged mother and waiting for Clive to return from the bank. Despite her comfortable lifestyle, she knows that all is not right in her world, and when she begins to suspect that Clive is having an affair events begin to move in a direction that she could never have imagined...