The year is 1434, and preparations are under way for the Corpus Christi festival in Oxford, England. Plays are a traditional part of the celebration, and Joliffe and the rest of his troupe are to perform Isaac and Abraham. Until then, their theatrical antics are in demand by a wealthy merchant who offers them an opportunity to ply their trade for room and board. But when the body of a murdered man is found outside the barn door where the troupe is lodging, Joliffe must raise the curtain on the merchant's mysterious past and uncover the startling truth behind a murder most foul...