Earth Song — Catherine Coulter

Philippa de Beauchamp, as impulsive as she is beautiful, flees her father's castle when she hears she'd to be wed to the repellent Baron de Bridgeport. But her daring escape in a wool wagon quickly becomes a misadventure and she winds up in the arms of Dienwald de Fortenberry, a rogue as smooth and bold as Acquitaine wine.

Soon Phillipa finds herself a prisoner at Dienwald's castle, where there are mysteries to be solved, villains to be bested, and a stubborn man's heart to won.