Earth's Last Gambit Books in Order

Astronaut Jack Kildare detects a signal from an alien ship orbiting Europa, prompting NASA to organize a mission to Jupiter. While fighting for a place aboard, Jack confronts espionage, sabotage, and murder that threaten Earth's response.

Arriving near Jupiter, Jack Kildare's crew approaches the mysterious alien spaceship orbiting Europa while sabotage divides their own vessel. An attack turns the mission into a struggle for survival, forcing Jack to unravel the intentions of their enemy.

With their ship wrecked on the Moon and alien forces devastating Earth, Jack Kildare's surviving astronauts face a desperate choice. From a vulnerable lunar colony, they devise a dangerous return mission to confront the invaders on their home planet.

Stranded on Europa and abandoned by mission control, Jack Kildare and his fellow astronauts pursue an alien vessel threatening Earth. Their long chase tests failing life support and a damaged crew, while another danger develops aboard their own ship.