While on a bicycle trip to their aunt's farm, the four Aldens help solve a mystery.

Bicycle Mystery 2012, Oasis Audio

ISBN-13: 9781613752272

Audiobook CD

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Bicycle Mystery 2011, Albert Whitman & Company, [Park Ridge, Ill.]

ISBN-13: 9780807507100

Trade paperback

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Bicycle Mystery 1990, Albert Whitman & Company, Chicago, IL

ISBN-13: 9780807507094

Trade paperback

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Bicycle Mystery 1970, Albert Whitman & Company, Morton Grove, Ill

ISBN-13: 9780807507087

Hardcover

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