"Crispin: The Cross of Lead" is a historical novel by Avi set in 14th-century England. The story follows a young peasant named Crispin, who discovers he is a lord's illegitimate son after his mother dies. Fleeing from danger, he embarks on a journey of self-discovery and adventure. Throughout his travels, Crispin encounters various characters, including a mysterious man named Bear, who becomes his protector and mentor. The novel explores themes of identity, freedom, and the struggle against oppression, highlighting the challenges faced by the lower classes during the medieval period.