Invaders Books in Order

A secret alien invasion targets Earth in search of the lost Polarions' powerful Starcore. Captured in Nevada and escaping in Greenland, Logan discovers an extraterrestrial stealth ship that lets him fight back against enemies operating underground, in the air, and beyond Earth.

Logan uses a stolen Galactic Guard ship to protect quarantined Earth from alien exploitation. Antaran Lord Beran's search for ancient Polarion relics beneath the polar ice threatens consequences far beyond the planet, forcing Logan to confront an opponent with overwhelming technology.

Two primitive human relatives hijack Logan's alien stealth ship to break into an Arctic underwater structure and sell its secrets. Unaware of the dangerous prisoner inside, they threaten Earth's safety while Logan struggles to stop them and evade human pursuers.

Logan and human survivors await rescue on an alien station near Saturn, only to discover the arriving dreadnought belongs to a hijacker. Armed attackers reveal a plan to plunder Earth's ancient technology and destroy the planet to conceal the crime.