Gage and Andre intercept and replace two German agents who parachuted into England on a secret mission. They must find out what the mission is and who is the British traitor who is leading it. But in doing so, they are putting themselves in as much danger from British troops unaware of their identity as they are from the enemy agents they are infiltrating.

In order to destroy a German decoding installation in Paris, the Jericho team must tunnel into it from a dress manufacturer's shop across the street, which does not please the owner of the shop.

Gage is on assignment to take out a German field marshal. But Sheppard and Andre learn from top brass that the field marshal is planning to arrange for surrender, and that thus they are to prevent Gage from completing his mission---by any means necessary.

The team's mission is to retrieve a German safe that contains the names of leaders of the French Resistance. The mission is complicated by the fact that they know there is an informer among the resistance.

Gage poses as a priest as the Jericho team plots to destroy German submarines that are located underneath a 600-year-old cathedral. The team hopes to destroy the subs without damaging the church.

A naive, timid civilian radar expert is assigned to assist the Jericho team in locating and then destroying a German anti-aircraft device in occupied Holland. The team is uneasy about using him due to his fumbling, happy-go-lucky style.

A German commander of occupational forces plans to force a kidnapped conductor to perform a Wagner piece on Bastille Day as propaganda for the Nazis in France. The Jericho team plots to sabotage this plan by taking the conductor's entire orchestra out of the country.

The Jericho team's mission is to travel to occupied Yugoslavia along with a French colonel know to be a double agent for the Nazis, and make sure he is captured so that he is able to give them false information he has been given. Complications arise when they are forced to bail out and found by resistance fighters, whose leader may have his own agenda.

Three youngsters meet the Jericho team when they land on a Norwegian island, and inform them that their contact has been arrested. The kids offer to help the team in their mission to bring an anti-occupation pastor to safety, but there is fear that they could unwittingly do more harm than good.