Books like Room 13 by Robert Swindells

Irish orphan siblings Molly (14) and Kip (10) travel to England and take up servant positions in a decaying manor, where they encounter a mysterious stranger and uncover the house's dark secrets.

A 12‑year‑old girl who lives in a wandering house with chicken legs and is training to be a Yaga must break rules to find a real friend, setting her on a perilous journey to the afterlife.

"I very much need to be dead." These are the chilling last words left by a man who had everything to live for but took his own life. In the void that remains stands his widow, FBI agent Jane Hawk, surrounded by questions destined to go unanswered unless she does what all the grief and fury inside her demand: Find the truth, no matter what. People of talent and accomplishment, people seemingly happy and sound of mind, have recently been committing suicide in surprising numbers. A disturbing pattern is beginning to emerge. Jane is determined to give up everything to find out why. And if that means going rogue and becoming America's Most Wanted, then so be it. Those arrayed against her are legion, and devoted to protecting something profoundly important-or terrifying-enough to exterminate any and all in their way. But Jane is as clever as these enemies are cold-blooded, as relentless as they are ruthless. And she is driven by a righteous rage they can never comprehend. Because it is born of love.

After his mother dies, 12‑year‑old David escapes into the stories that once comforted him, only for myth and war to collide in a world where a Crooked Man and a faded king rule over wolves and hidden secrets.