A leak is traced to a small sub-section of the secret service, sparking off the inevitable security checks, tensions and suspicions. For Maurice Castle, it is the end of the line anyway, and time for him to retire to live peacefully with his wife and child. But no-one escapes so easily from the lonely, isolated, neurotic world of the SIS

A leak is traced to a small sub-section of the secret service, sparking off the inevitable security checks, tensions and suspicions. The sort of atmosphere, perhaps, where mistakes could be made? For Maurice Castle, it is the end of the line anyway, and time for him to retire to live peacefully with his wife and child. But no-one escapes so easily from the lonely, isolated, neurotic world of the SIS