Ever since they left Earth about 76 MYA, the Ryozae (pl. Ryozaem, otherwise referred to as Saurians) have had little to do with it, until a near-tragedy results in the foundation of the Extraterrestrial Homeland Invasion Control System, or ETHICS. When the peace and security that ETHICS works so hard to maintain is endangered by a threat unlike any they've ever faced before, Bernard Sparker, his cousin Jez, and his best friend Mireia find themselves being drafted into service (or isn't that re-drafted?!). Together, with the rest of their team, they attempt to accomplish what no one else has ever been able to before, and do their best to keep their world - or any other world - from ever finding out about it!
The fourth part of the saga, but it is meant to be able to stand on its own.