A Map of Days by Ransom Riggs (2018) Dutton Books

The fourth novel of Mrs Peregrine’s Peculiar Children – in which Jacob and his friends are now celebrities in Peculiardom.  When Jacob and his friends go to clean Jacob’s grandfather’s (Abe) house, they discover a couple of important things: Abe’s logbook where he was saving Peculiar Children, and a matchbook with a phone number.  Jacob finds himself trying to do what Abe did with a little help from his friends.  Only it all goes wrong once they find the Peculiar they’re trying to help.