Henchick is the leader of the Manni of the Redpath Clan. He is about eighty years old and has three wives. He is either the father or the grandfather or Margaret Eisenhart. He helps Roland Deschain and his ka-tet enter the Keystone World through the Unfound Door in Doorway Cave. His Twinner in the Keystone World is the Reverend Earl Harrigan.
Roland spoke with Henchick on the night where he danced the commala in front of Calla Bryn Sturgis. Roland wanted to know if he it was possible to cross over into the Keystone World to protect Calvin Tower and if Henchick would help.
After Susannah Dean and Mia's disappearance after the Wolves' defeat, Henchick and many of the other Manni go to Doorway Cave with the ka-tet to help them into the Keystone World, using their plumb bobs and magnets.