Ghost Knight by Cornelia Funke
Eleven-year-old Jon Whitcroft and new friend Ella summon the ghost of Sir William Longspee, who may be able to protect Jon from a group of ghosts that threatens him harm from the day he arrives at Salisbury Cathedral’s boarding school. Includes historical notes.
The Crowfield Curse by Pat Walsh
In 1347, when fourteen-year-old orphan William Paynel, an impoverished servant at Crowfield Abbey, goes into the forest to gather wood and finds a magical creature caught in a trap, he discovers he has the ability to see fays and becomes embroiled in a strange mystery involving Old Magic, a bitter feud, and ancient secrets.
Theodosia and the Serpents of Chaos by RL Fevers
Eleven-year-old Theo uses arcane knowledge and her own special talent when she encounters two secret societies, one sworn to protect the world from ancient Egyptian magic and one planning to harness it to bring chaos to the world, both of which want a valuable artifact stolen from the London museum for which her parents work.