The Girl in Wooden Armour

When Hattie and her brother Jonathan arrive at their Granny's cottage in the mysterious Brokewood Valley, they discover she's vanished without a trace. Hattie soon learns that old magics and dark forces lurk beneath the earth, and as she investigates, she uncovers secrets that might connect her grandmother's disappearance to her mother's death seven years ago. She must find answers before the valley's dangerous powers consume everything she loves.