Was to have been written by Andrew Cartmel, and would have introduced a cat burglar/safecracker as the next companion. The character with underworld connections from "Thin Ice" would be featured as an older individual and the father of the new companion. "Crime of the Century" (another title invented by Owen for "27 up") was later adapted by Cartmel for Big Finish's "The Lost Stories" range in May 2011. Cartmel would have preferred to call the story "Action at a Distance". The audio adaptation of Earth Aid makes references that this story takes place before it. This version also features Ace.