In Time Travel to mysterious Lake Tahoe, Jack Campbell, and his companion, Weird Willy must investigate a rare meteoric explosion which has dusted the lake and its inhabitants with a concentrated dose of the mineral, Antis. This same mineral has been responsible for extraordinary effects upon any time traveler who's worn a Martian Medallion forged with only a trace of it. Lucius, the leader and surviving members from the Dark Brotherhood also detect the explosion and are still trying to destroy Jack and his friends. The dusting of Lake Tahoe awakens Tessie, its deep lake creature, to begin unheard of attacks upon humans, awakens the somnambulistic sleep of Chinese bodies and others now healed and preserved beneath the lake's waters. The mineral grants all living forms the temporary ability to time travel without a machine. This furthers the conflict between Jack and the Brotherhood while Tessie destroys planes, boats, and fights with the military, and the awakened Chinese begin their new future in a new time.