Parallel in Jeopardy is the third book in the PARALLEL MISSION series. In the first two books, members of an elite team from a parallel universe enter the Earth Parallel to recruit team members on Earth Parallel to change the course of the history of both parallels. "As it is in Earth Parallel, it will be in other parallels." Their rescue missions spanned the globe, beginning with Earth recruits visiting the centuries-advanced parallel where scientists and technicians trained and prepared them for their Missions. Then, a European "vacation" became the staging place as they prepared to spread the message: "Violence begets violence. Peace begets peace. More Team members are recruited, as the Missions require more members.

Alien, government, and criminal elements enter the picture early, attempting to identify the Mission Team and capture their Ship and technology. The Parallel scientists will only provide the Team with equipment that has already been invented on Earth or is on the drawing boards but not in use. Thus, it appears their cigar-shaped Ship, their Suits, and other space-age technology are far more advanced than any other being used on Earth. A renovated farm near Omaha is where the Ship and the supplies are stored and prepared for the various Missions.

In Parallel in Jeopardy, a work project in Mexico, sends Derek, the Earth-Team leader, to Mexico City on a purchasing assignment. An unidentified organization recruits Derek to help them find and capture the Mission Team and their equipment--especially their Ship. Derek recruits a local driver to show him the city and seek reports about the "aliens and their Ship."

Numerous encounters in Mexico and other countries threaten the continuation of the Missions. Even Derek's return to the States is fraught with challenges. Yet, despite the difficulties, enduring friendships are forged.

At the same time, Derek's brother-in-law, a disbeliever in all things alien, encounters an alien visitor who steps out of his closet. Tilden is the alien whose presence creates a crisis for Bryce, his family, and the Team. His turmoil increases as he gets to know "Tilden."

A crisis in Egypt draws the entire Team to assist with rescue efforts. Unfortunately, the work is complicated by terrorists, military, and police who have sworn to capture or destroy the Team and their Ship. Will their message finally sink in? Violence begets violence! Peace begets peace!