In which Dr. Toole and Mr. Lowe investigate the mysterious disappearance of Mr. Nutter, discovering a telling footprint by the river that hints at troubled recent events, whilst Toole offers some comfort to the distraught Mrs. Nutter. The episode also finds Toole reflecting on the slow pace of pursuit in their day, and visiting the fading Mr. Sturk, whose life draws quietly to a close under a shadow of past conflicts.