On Fortune's Wheel is an adventure that takes place in an undefined medieval kingdom. Birle is the independent daughter of an innkeeper. Her grandparents taught Birle to read and write, skills common people are forbidden to learn. Birle has accepted the marriage proposal of Muir, a huntsman, simply to escape her life of drudgery, though she does not care for him. Shortly before the wedding, Birle unwittingly embarks on a quest; with Orien, a Lord fleeing his fate, she is shipwrecked. The two are captured and sold into slavery along with a simple-minded giant named Yul. They escape and return to the Kingdom, where Orien assumes his role as heir apparent. Realizing that she can never be happy as a Lady, Birle flees to a simple farm holding where her daughter Lyss is born. Orien is unable to face life without Birle and soon joins them...