The grown-ups all think she's going to die soon-she can see it in their eyes. Still, when poor twelve-year-old Stina is sent to remote Raspberry Hill Sanatorium she can't believe her luck. She gets to ride in a real motor car to the hospital, which looks like a magnificent castle hidden deep in the forest.

But as Stina explores the long, echoey corridors of her eerie new home, she begins to suspect that the building is concealing a dark secret. How did the old East Wing burn down? Why doesn't her mother reply to any of her letters? And what are the nurses all so afraid of? Stina is determined to solve the mystery of Raspberry Hil­l-but as she edges closer to the truth, she finds herself in terrible danger...