The Charmed Children of Rookskill Castle by Janet Fox

This chilling World War II mystery blends historical fiction with supernatural suspense as three London children are evacuated to a remote Scottish castle to escape the Blitz. Kat Bateson, armed with her father's advice to "keep calm and carry on," quickly realizes Rookskill Castle is more dangerous than the city they left behind, with its shifting hallways, strange mechanical noises, and a collection of oddly silent fellow children. The novel masterfully weaves together the very real fears of wartime separation with a creeping, gothic dread, creating an atmosphere where every shadow could hide a ghost or a Nazi spy. Young readers who enjoy unraveling a layered puzzle will be captivated by the castle's secrets and the true nature of the "charm" the children are supposed to be learning.

Fox distinguishes her tale with a clever dual-layered mystery, asking whether the true threat is supernatural or human, a question that will deeply engage fans of both historical fiction and fantasy. The protagonist, Kat, is a wonderfully logical and resilient heroine whose passion for mechanics and code-breaking provides a refreshing and empowering angle. This book is ideal for middle-grade readers seeking a sophisticated, spine-tingling story that doesn't rely on jump-scares but instead builds a profound sense of unease. The satisfying resolution ties together the threads of magic, history, and courage, leaving a lasting impression about the strength found in family and sharp wits.