Plot

The team investigates the murder of an anonymous tramp on a London Underground train 15 years earlier.

Following a warehouse robbery, Pete Offord's DNA is linked to that of an anonymous tramp who was murdered on a London Underground train 15 years earlier. Pete's snobbish aunt Janice, who cast his mother Iris out long ago, directs the team to Iris's 'unsuitable' lover in Essex, David Allenforth, a depressive who went missing just before the murder. David's brother Charles had hired a disreputable private eye McHugh to trace him but he drew a blank. No Ticket Tony, however, a terminally ill former associate of David's, did locate him and holds the key to the mystery, which is finally tied up by Jack's 'Columbo' act.—don @ minifie-1

Sandra and the team investigate the death of a tramp who died some 15 years ago. They have little to go on other than a DNA link to Peter Offord who was raised by his mother and knew nothing of his father whose name isn't even listed on his birth certificate. Offord's aunt, Janice Pargetter, tells them her sister had a brief affair with a man by the name of David Allenworth who had disappeared long ago. David's brother Charles had also looked for his brother at the time of his disappearance and even hired a private detective to look into it but to no avail. They quickly come to the conclusion that the dead tramp and the missing David Allenworth are the same person. Who murdered him and why isn't quite as simple to figure out.—garykmcd