J
Jenny Nimmo
The Children of the Red King
Charlie Bone discovers he has magical powers inherited from his ancestor, the Red King. He attends a special academy where he and his friends must solve mysteries and confront dark forces threatening their world and the legacy of the Red King.

Charlie Bone
The Children of the Red King #1
Charlie Bone and the Time Twister
The Children of the Red King #2
Charlie Bone and the invisible boy
The Children of the Red King #3Charlie Bone and the Castle of Mirrors
The Children of the Red King #4
Charlie Bone and the Hidden King
The Children of the Red King #5
Charlie Bone and the Beast
The Children of the Red King #6
Charlie Bone and the shadow
The Children of the Red King #7
Charlie Bone and the Red Knight
The Children of the Red King #8The series should be read in publication order, starting with "Midnight for Charlie Bone," followed by "Charlie Bone and the Time Twister," "Charlie Bone and the Blue Boa," "Charlie Bone and the Wilderness Wolf," "Charlie Bone and the Hidden King," "Charlie Bone and the Beast," and concluding with "Charlie Bone and the Shadow of Badlock."
Yes, there is a prequel series called "The Chronicles of the Red King" which explores the history of the Red King and his descendants, providing background to the events in Charlie Bone's world.