A crowded inn means that a man and a woman must share the same room for a night. One problem is that they are both married - to other people. The other problem is that they used to be engaged to each other.

'Affianced Foreign Office agent searches for mystery woman he loves.' (British Film Catalogue)

Mrs Todd is aggrieved at finding that the country house she has bought is evidently haunted. Sir Hector Benbow and his nephew, on behalf of the previous owner, set out to demonstrate that there is no ghost.

Going under cover, P.C. Mahoney passes for a gentleman to get into the notorious Moonstone Club. There he meets Clifford Tope, a ne'er do well who is love with cabaret star Cora Mellish. She in turn has run up steep gambling debts and has paid off the Club's blackmailing owner with a stolen necklace. As things heat up Cora seeks help from the easy-going Tope.