The Walls of Westernfort (The Celaeno Series, 1)

All Natasha Ionadis wants is to serve the Goddess as a Temple Guard, and she volunteers eagerly for a dangerous mission to infiltrate a band of renegade warriors and imprinters. But, once away from the temple, the issues are no longer so simple and she must revaluate her beliefs, especially in light of her growing attraction for one of the outlaws. Is it too late to work out what she really wants from life?