Tom Riddle communicates with Ginny Weasley and Harry Potter through his diary. He ingratiates himself with Ginny and forces her to write messages in blood on the walls of the castle. Originally a regular 1943 diary bought by Tom Riddle at a Muggle stationery store on Vauxhall Road in London. Subsequently, Tom turned him into a horcrux, apparently using the death of the Crybaby Myrtle to tear his soul apart. The part of Voldemort's soul enclosed in the diary keeps his memories of how the Room.