What is the main conflict in On Fortune's Wheel by Cynthia Voigt?

On Fortune's Wheel is an adventure story told in three parts. In Part One Birle is "The Innkeeper's Daughter."

But she is not content to spend her life working from dawn till dusk, baking bread, scrubbing floors, or attending to the many other duties of the inn under the direction of her stepmother. So, when she has a chance for adventure, she takes it willingly and begins a journey down the river with Orien, a young Lord, who, like Birle, is unhappy with his fate. Their journey, however, ends in shipwreck, and they are sold as slaves in a foreign land.

In Part Two Birle becomes "The Philosopher's Amanuensis." Her master is a learned man who ap