The Accursed from 1957 is also known as "The Traitor."
Donald Wolfit stars as Colonel Price, a British member of the resistance, who brings his ex-resistance group members to his house in England. The group includes a Polish pianist, Thomas (Anton Diffring), Stefan Toler (Carl Jaffe) and his daughter, Vicki (Jane Griffiths), Friedrich Suderman (Karl Stepanek), and Thomas Rilke (Oscar Quitak).
They meet each year on the anniversary of their great leader, whom someone betrayed to the Nazis. This caused him to be murdered. The murderer, Price announces, is present in the house.
They await a messenger from London, but he is knifed before he can tell Price who the killer was.
Two military men arrive, Major Shayne (Robert Bray) and Lieut. Grant (John van Eyssen) arrive, who say their car is out of order and ask to use the phone. Price isn't fooled; neither are the others. They are there to investigate what's going on.
Meanwhile Price attempts to determine who the killer was. Then there is another murder. Are more coming?
Christopher Lee plays a doctor.
I wondered if this had been a play because it doesn't open much, and it's also talky, but it wasn't. It manages to hold one's interest, though not all of the acting was up to par, mainly Robert Bray's performance.