 Hibbard is a member of “the League of Atonement”, a group of college friends who once played a prank on Chapin that, to their lingering shame and remorse, left him permanently crippled.In addition to Hibbard's disappearance, two other members of the group have also died under mysterious circumstances, and both Hibbard’s niece Evelyn and the police suspect that Chapin has murdered them.Wolfe acquires a list of the other men in the League and summons them to his office, where he proposes to both determine the truth behind the deaths of their mutual friends and remove the threat that they believe Chapin poses.