The very secret society of irregular witches

"As one of the few witches in Britain, Mika Moon knows she has to hide her magic, keep her head down, and stay away from other witches so their powers don't mingle and draw attention. . . . An unexpected message arrives, begging her to travel to the remote and mysterious Nowhere House to teach three young witches how to control their magic. It breaks all of the rules, but Mika goes anyway, and is immediately tangled up in the lives and secrets of not only her three charges, but also an absent archaeologist, a retired actor, two long-suffering caretakers, and... Jamie. The handsome and prickly librarian of Nowhere House would do anything to protect the children, and as far as he's concerned, a stranger like Mika is a threat"--Provided by publisher.