First three episodes of the 1970 Thames Television series starring Edward Woodward as a tough secret service operator. In 'Where Else Could I Go?' Callan (Woodward) tries to weadle his way back into the service. In 'Summoned to Appear' the death of an innocent man leaves Callan with some explaining to do. And in 'The Same Trick Twice', a planned East-West exchange of captured agents goes wrong and everything becomes very confusing indeed.