The Sleepwalker is the ninth novel in the CHERUB series by Robert Muchamore. It was released in February 2008. The book features Lauren Adams and Jake Parker in the lead roles, investigating an airline crash that a mentally disturbed boy called Fahim claims was caused by his father. Meanwhile, James Adams has a subplot doing work experience with Kerry Chang at a fast food restaurant. This is the first CHERUB book to feature Lauren in the lead role, with James' story as a subplot. Source: Wikipedia (en)