Henry Gallant and the Great Ship: The Henry Gallant Saga, Book 7 (Unabridged‪)‬

Two galactic empires want to eliminate Earth. 

The ancient Chameleon have an AI chip implanted in their brain. The genocidal Titans are methane-breathing, autistic savants. Together, they have found a common alien credo....

All humans must die. 

Henry Gallant’s exceptional ability to interface with AI has made him the key to stopping both species. Together with simulation expert Daniel Logan and forensic xenoarchaeologist Kate Mahoney, he must create the resources to overcome the aliens’ technology advantages in stealth, lasers, and shields. 

For fans of Horatio Hornblower.