No Going Back — Mark L. Van Name

ENOUGH IS ENOUGH
Jon and Lobo are back -- and everything is about to change.

If they both survive.

Haunted by memories of children he could not save, Jon Moore is so increasingly self-destructive that even his best friend, the hyper-intelligent Predator-Class Assault Vehicle, Lobo, is worried. When Jon risks meeting a woman from his distant past and undertakes a high-stakes mission, Lobo fears this will be their last.

The job is illegal.

They have to take on one of the oldest, most powerful men alive.

Two different security forces are tracking them.

And Jon is falling in love.

Desperate and out of options on a world so inhospitable that its statues and monuments outnumber its living inhabitants, Jon and Lobo encounter their deadliest challenges yet. They must make decisions from which there truly is No Going Back.