sentences:  The film lost its director just days before filming was scheduled to begin, leading producers Mario and Pietro Bregni to appeal to Mario Bava to take over.Though there is no record of who the original director was, Mario Bava biographer Tim Lucas reasons that it was mostly likely Guido Malatesta.Bava was very reluctant to take on the project, since he felt the script was a poorly written ripoff of Agatha Christie's novel "And Then There Were None", but agreed to do it under the condition that he be paid up front.