The Greek coffin mystery (1932)

A missing will leads Ellery Queen to a coffin containing something unexpected, then to a sequence of explanations that must be tested and revised. This is a long, argumentative puzzle for readers willing to distinguish a persuasive story from a conclusion that survives every fact. Its explicit challenge to the reader provides a natural place to stop and commit an answer. Expect a more strenuous exercise than the urbane detective's confidence initially suggests.