Shelter Me by Alex McAulay

Maggie Leigh just wants to be a normal teenager, but when German bombs tear apart London during World War II, her ultra-religious mother sees the destruction as divine punishment. She sends Maggie to a remote boarding school in coastal Wales, supposedly to keep her safe, but also to keep her in line. The school is creepy, the headmistress is a lunatic, and the students range from spoiled rich girls to speechless trauma victims. But when a tragic accident happens on the beach, Maggie and three friends are forced to flee the school, plunging into the nightmarish world of Europe during wartime. Now every decision Maggie makes is fraught with danger, and living to see another day depends on how quickly she can think and act...and how far she's willing to go.
So far, Shelter Me is the best of Alex McAulay’s work. This dark, thrilling story is set in one of the most nightmarish times in history: World War II. The character of Maggie is a fierce, complex heroine-who happens to have the best name in the world ;). The novels breakneck-paced propelled me through the pages and the twist at the end nearly knocked me off my chair. I’m out of words at the moment, but believe me when I say that it’s awesome and that you should go and read it…that means now!