Mrs. Peregrine's Peculiar Children - Ransom Riggs (2011) Quirk Books (8/19)

Teenage Jacob goes to an island off the coast of Wales with his birding father who is immersed in writing a new book.  Jacob, bored and wandering the island, finds the ruins of an abandoned house.  Only it’s not exactly abandoned, it’s trapped in a time loop from World War II.  And its occupants are peculiar indeed.

A wonderful and well thought out adventure.  You'll fall in love with the children.