Four private eyes match their wits against the invisible doorbell ringer.

The Case of the Dumb Bells 1982, HarperCollins Publishers, New York, NY

ISBN-13: 9780064440301

Harper Trophy edition

Trade paperback

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The Case of the Dumb Bells 1982, Turtleback Books

ISBN-13: 9780808529927

Turtleback School & Library edition

Hardcover

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Case of the Dumb Bells 1967, Mammoth, London

ISBN-13: 9780437900456

Hardcover

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The Case of the Dumb Bells 1966, HarperCollins Publishers, New York, NY

ISBN-13: 9780060206246

Hardcover

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The Case of the Dumb Bells 1966, Turtleback Books, New York, NY

ISBN-13: 9780606004084

Turtleback School & Library edition

Hardcover

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