If Wishes Were Horses - S3.E4

Lynley and Havers investigate the murder of Professor Dermot Finnegan, an old friend and mentor of Helen's who has been killed by a car bomb. Helen, who is pregnant, is later attacked in her car, and on admission to hospital her baby is found to have died. Havers searches Finnegan's office and finds love letters from several women - including one from Helen. She suggests that Lynley should be taken off the case, but he is determined to go on with it for the sake of Helen. In the end, Lynley has a shocking confrontation with the killer.