The Birddog Tape — Barry Norman

Bobby Lennox, a successful London realtor and ex-boxing champion, is a frequent victim of mistaken identity, whether from his questionable resemblance to film actor Michael Caine, or now due to a mixup that convinces some mobsters that he's a hit man - one who can get rid of a Hollywood producer and his beautiful wife.
But when the wife turns out to be Lennox's former girlfriend, he has to prevent the murder he was hired to commit, following a trail that leads him through the inner circles of the Los Angeles elite and into a startling case of treachery and deceit.