The Cure of All Diseases - The Gods of Seraph, #1

How far would even the best of men fall with fear of death as the driver?Newlyweds Meneteth and Neral visit Meneteth's uncle Valyn but wake to find they have been subject to a terrifying magical transformation reverting them to pre-teens. Leaving Meneteth's similarly transformed sister Cantathera they flee Valyn's stronghold. Trapped in the bodies of children and branded thieves they cannot return home and are reduced to following the advice of Valyn's desperately worried apprentice: they seek out the Master of Castle Aiding.
But Aiding's lord has a reputation as dark as Valyn's ambition, and enemies of his own. The young couple have little to bargain with except their lives -- and their souls. Somehow they must recruit the Master to their cause and uncover the mystery at the heart of Valyn's change from benevolent uncle to evil sorcerer while striving to keep their marriage intact. Will what they have be enough to buy the help they need to stop Valyn sacrificing Cantathera to achieve the healing he craves?