Which author wrote 'The Thin Man'?

The author who wrote The Thin Man is Dashiell Hammett.

Published in book form in 1934, the novel follows Nick and Nora Charles, a wealthy, witty couple drawn into a murder investigation in New York. Nick narrates the story, giving Hammett's hard-boiled crime writing an unusually comic, sophisticated tone.

The title refers to Clyde Wynant, an eccentric inventor whose disappearance drives the mystery—not to Nick Charles, as readers sometimes assume. The book began as a more conventional private-eye story set in San Francisco, but Hammett reshaped it into a comedy of manners.

The successful 1934 film, starring William Powell and Myrna Loy, made Nick and Nora even more famous and led to five film sequels. Hammett never completed another novel after The Thin Man.