Witchfinder, Volume 3 The Mysteries of Unland — Mike Mignola

Sir Edward Grey is sent to Hallum to investigate the death of a crown-appointed official, but once he is there he hears rumors of the mysterious Unland, the wetlands around the town, and the creatures that inhabit it. Grey's skepticism of the murder vanishes when he encounters the monsters of Unland, and he realizes that Hallam is a place of secrets.