Hollow City (Book 2 of Miss Peregrine's Peculiar Children series), by Ransom Riggs (2014)

We rowed through the harbor, past bobbing boats weeping rust from their seams, past juries of silent seabirds roosting atop the barnacled remains of sunken docks, past fishermen who lowered their nets to stare frozenly as we slipped by, uncertain whether we were real or imagined; a procession of waterborne ghosts, or ghosts soon to be.

Hollow City begins where Miss Peregrine's Home for Peculiar Children left off.  Jacob Portman and his friends make the treacherous journey from Wales to London to find a cure for their beloved Miss Peregrine.  But it's 1940s England, and wights and hollows lurk everywhere.

This is a page-turner!

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