 Chamber of Secrets has many links with the sixth book of the series , Harry Potter and the Half @-@ Blood Prince . In fact , Half @-@ Blood Prince was the working title of Chamber of Secrets and Rowling says she originally intended to present some " crucial pieces of information " in the second book , but ultimately felt that " this information 's proper home was book six " . Some objects that play significant roles in Half @-@ Blood Prince first appear in Chamber of Secrets : the Hand of Glory and the opal necklace that are on sale in Borgin and Burkes ; a Vanishing Cabinet in Hogwarts that is damaged by Peeves the Poltergeist ; and Tom Riddle 's diary , which is later shown to be a Horcrux . Additionally , these two novels are the ones with the most focus on Harry 's relationship with Ginny Weasley . 
