When a mother is found dead on the local food market, Dan and Flemming find out that the woman, who is a lottery winner, has been a victim of a marriage swindler. They manage to capture the swindler's accomplice and male lover.

Dan and Flemming create a false identity for Marianne, who will pretend to be another lottery winner in order to get the marriage swindler out from hiding and hopefully caught. But the man has an alibi. Who is really the killer?