Earthdivers (Earthdivers #3)

The Indigenous chrononauts' plot to sabotage the mission to the so-called New World takes a strange turn. Reeling from disaster, the Niña's crew places Tad under lock and key and Columbus develops a disturbing personal interest in his would-be assassin. As the admiral lets down his guard to decide if this prisoner is a godsend or Satan himself, Tad moves to make the most of the situation. But as his influence on the past intensifies, his wife and friends in 2112 find themselves in the crosshairs of a new history.