The Battle for Ka'an (Electronic book text)

"Trust no one," the Immortal told Captain Dav Vad. Her ship and crew held hostage, the Dishonorably Discharged Ex United Universe pilot is marooned on the planet Chosen. With the help of her two Arti Intel German Shepherds, she is given a mission to find a King Attuicus that has mysteriously disappeared. On the trail of the King, she rescues a young Roman girl, meets a woman who can heal with a touch and a Prince and General on their way to defend the City of Ka'an from the Barbarians. But, one of them is a spy and soon they will possess the knowledge of how to destroy the city and bring the downfall of the New Roman Empire.
In the end, Dav realizes she trusted the wrong person.