The Infinity Clue

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Title The Infinity Clue
Author Franklin W. Dixon
Country United States
Language English
Series Hardy Boys
Genre(s) Detective, Mystery novel
Publisher Wanderer Books
Released 1981
Media type Print (Paperback)
Pages 190 pp (first edition paperback)
ISBN ISBN 0-671-42342-8 (first edition paperback)
Preceded by The Four-headed Dragon
Followed by Track of the Zombie

The Infinity Clue is the title of a Hardy Boys Digest novel, written by Franklin W. Dixon. Sometimes it goes by the number of 70 in the series, a continuation of the original novels, and sometimes as the 12th, as it is the 12th published by Simon & Schuster after Grosset & Dunlap lost rights to publish new Hardy Boys books in 1979.

Spoiler warning: Plot and/or ending details follow.

Frank, Joe and Chet travel to Washington DC to investigate the theft of a diamond. Fenton Hardy has gone missing, and the sign of infinity begins to haunt the boys as it follows them everywhere!