 The role of Wolfe's assistant Archie Goodwin was reprised by Lionel Stander.Professor Hibbard (Leonard Mudie) requests detective Nero Wolfe's assistance in tracking down the sender of a few sinister letters, which killed two of Hibbard's acquaintances.Prominent author Paul Chapin (Eduardo Ciannelli), who is a cripple, is pinpointed by Wolfe as the culprit.