XK9 Rex is a dog who knows too much. Now his past is gunning for him.

Rex and his Packmates were bio-engineered and cyber-enhanced to be cutting edge law enforcement tools. So smart they're considered uplifted sapient beings on Rana Habitat Space Station. Rex may be the Leader of the Pack on Rana, but his past is still on his trail.

Before Rex came to Rana Station, he ran afoul of Transmondian spymaster Col....

XK9 Rex is a dog who knows too much. Now his past is gunning for him.

Rex and his Packmates were bio-engineered and cyber-enhanced to be cutting edge law enforcement tools. So smart they're considered uplifted sapient beings on Rana Habitat Space Station. Rex may be the Leader of the Pack on Rana, but his past is still on his trail.

Before Rex came to Rana Station, he ran afoul of Transmondian spymaster Col. Jackson Wisniewski. He deliberately flunked out of the espionage program and threatened Wisniewski's life. Now Wisniewski wants Rex dead. Transmondian agents watch and wait for any opportunity to strike.

Rex takes pains to evade his old enemy. His human partner, Charlie, faces a different struggle. He works to recover from catastrophic injuries - and comes face-to-face with a once-in-a-lifetime love he thought he'd lost forever.

Can Rex and Charlie confront their pasts and secure their futures? Or will events force them to sacrifice everything?