Charlie Bone and the Time Twister

Charlie Bone and the Time Twister is the second book in Jenny Nimmo's series, where a boy named Henry Yewbeam is accidentally sent from 1916 to the present day by a special marble called the Time Twister. He arrives at Bloor's Academy and needs help from Charlie Bone to stay hidden from his scheming cousin, Ezekiel Bloor, who has sinister intentions. The story involves Charlie and his friends trying to protect Henry while dealing with the dangers of the academy and the threatening Yewbeam family.