He is briefly mentioned in "Harry Potter and the Goblet of Fire" where following the Death Eaters attack at the Quidditch World Cup, Mundungus put in an insurance claim to the Ministry of Magic for a twelve-bedroomed tent with an en-suite jacuzzi, while in reality, he had been sleeping under a cloak propped on sticks. As a member of both the original and the newly reformed Order of the Phoenix, he is assigned guard duty to protect Harry, but abandons his position to conduct a shady cauldron-trading deal, leaving a critical opening through which Dementors manage to attack Harry. In "Harry Potter and the Half-Blood Prince", Harry catches Mundungus outside the Three Broomsticks trying to sell what had been Sirius' property (which now belongs to Harry after Sirius' death) to Aberforth, and the boy confronts him. Mundungus goes into hiding but is later jailed in Azkaban for impersonating an Inferius during a botched robbery.