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THE HARDY BOYS ONLINE: An unofficial online resource for fans of the Hardy Boys books

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Book details

The Alien Factor

Volume #2 in the Hardy Boys and Tom Swift Ultra Thrillers series

  • Publication date: 1993
  • Summary: The Alien Factor involves "a visitor from outer space who is as beautiful as she is strange" (quoting the back cover). The boys' time-travel exploits in the previous book have conveniently wiped away their memories of the time they spent together, making them near-strangers once again. This allows Frank and Joe to be initially suspicious and distrustful of the Swifts.

Cover art (click thumbnail to enlarge)