Das Geheimnis der schwarzen Koffer

Once again, a serial killer is on the loose in London, first packing his victims' suitcases, then killing them with a knife. An inspector from Scotland Yard tries to get to the bottom of the mysterious events and enters a mysterious castle... First attempt by Artur Brauner's production company CCC to emulate the success of the Rialto series of Edgar Wallace thrillers. Adapted from a book by Wallace's son Bryan.

Other film adaptations:
"Der Todesrächer von Soho", 1972, Jess Franco.