The Island of Ghosts — Eilis Dillon

The Island of Ghosts is a haunting story that takes place on a remote island off the west coast of Ireland. When Dara and Brendan don't return from their sailing trip with Mr Webb to the Island of Ghosts, everyone in the village assumes they have drowned, except their sisters Barbara and Cait. The two girls borrow a boat and set out to find their brothers, but they too become captives of Mr Webb on the island.