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144 pages, Paperback
First published March 1, 1955
"The book, which became an instant bestseller, reintroduced a gimmick (the Sealed Mystery) previously used by Harper from 1929 to 1934 -- a thin blue wrapper bound into the book, three-quarters of the way through, challenging the reader to either break the seal and read the conclusion of the story, or return the book and get their money back."