Thomas Banacek (played by George Peppard) was a Polish freelance insurance investigator in Boston. He enjoyed a well-to-do lifestyle, funded by his ability to solve 'impossible' cases where items were lost or stolen in extremely unusual circumstances. There was also usually a career investigator on the case who was intent on finding the item first. Banacek had a chauffeur/gofer - Jay, and a close friend Felix who owned a bookstore. Banacek also had a tendency to quote 'old Polish proverbs' - which usually made no sense!