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In page Three Act Tragedy:

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The novel's true first publication was the serialisation in the Saturday Evening Post in six instalments from 9 June (Volume 206, Number 50) to 14 July 1934 (Volume 207, Number 2) under the title Murder in Three Acts, with illustrations by John La Gatta. This novel is one of two to differ significantly in American editions (the other being The Moving Finger), both hardcover and paperback. The American edition of Three Act Tragedy changes the motive of the killer, but not so significantly as to require adjustment in other chapters of the novel.[citation needed]