Warner Oland in classic mystery set in old house with secret passages. Lots of clues and comic relief done extremely well by Herbert Mundin as butler Baxter. Story has sufficient twists and turns to keep interest and keep ending unpredictable. Chan brings multitude of suspects together in room at end: `Motive for recent murders like tangle of many strings, ends of which held by persons in this room.' Like in most Chan films, the missing clue that cinches the case is not revealed until the guilty party is in custody. Good lighting makes the séance scenes even spookier.' Recommended.