During a Divination lesson, Harry experiences another dream involving Voldemort punishing Wormtail for a 'mistake.' Harry tells Dumbledore about this, and stumbles upon a memory-keeping device in Dumbledore's office, a Pensieve. Inside the Pensieve, he discovers that Ludo Bagman was accused and acquitted of Death Eater activity, and that Barty Crouch's son was sent to Azkaban for supposedly helping to torture Neville Longbottom's parents into insanity.