The Mystery of the 13th Guest is a 1943 American crime/mystery film directed by William Beaudine and released by Monogram Pictures.

The film stars Helen Parrish as a young woman who returns to her grandfather's house 13 years after his death to read his will according to his wishes.

When Marie Morgan (Helen Parrish) was eight years old, she attended a banquet held by her dying grandfather, who disliked everyone in his family except her.

Police Lt. Burke (Tim Ryan) and Private Investigator Johnny Smith (Dick Purcell) are put on the case, but it is soon revealed that Marie is still alive.

While he does not find a similar novelty in this version, he admits "it has efficient direction from William Beaudine and the comic relief manage to keep on the right side of annoying.