The Second Floor Mystery is a 1930 American pre-Code film directed by Roy Del Ruth.

The film stars Grant Withers, Loretta Young, H. B. Warner and John Loder.

The next day West inserts an ad, under the alias of Lord Strawberries, which requests her friendship.

Ferguson, using the alias of Lady Grapefruit, places an ad in reply which suggests that he should write a series of five letters proving himself worth knowing.

West makes up a fabulous story about a murder mysterym based on the things he has heard his upstairs neighbors arguing about.