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A man is shot outside a restaurant where Dr. Graf is celebrating with friends. The man sustains a head wound which leaves him in a state of amnesia. He has no idea why he was being pursued by a group of Roumanian criminals, and has no idea who he is.
With Rex's gentle help, the man's memory gradually returns, and he realises that his girlfriend is in danger from the gang who are abducting Roumanian women and smuggling them into Germany to act as prostitutes.