Early 2010's YA mystery series

A boy moves to a town by a beach where mysterious and strange things happen. The boy makes friends with another boy (who likes to drink milk) and girl and they investigate the strange hapenings around the town. Some plot pionts involve a hermits watch, a hole in a tree, and the rock wall on the beach. The first book (I think) has the boy traveling to a different version of the town (don't remember how) where a witch kidnaps kids (don't remeber why). Before the boy gets kidnapped he comes across his house and finds the skeletons of his parents in their bed. The boy escapes that version of the town by breaking an hourglass.