Based on Ridley’s hit play, this novelisation by Ruth Alexander does very, very little to convert this into a novel. It still has a three-act structure, it’s mostly dialogue, with the action restricted largely to three rooms!
The play was adapted many times into feature films, most famously the Arthur Askey comedy of 1941, and appears to have influenced the 1937 Will Hay classic Oh Mr Porter!
The novel is most successful in the third act, but the first two are interminable and repetitive - a very slow police investigation that undermines the supernatural potential of the closing act.