The Island of Adventure and The Castle of Adventure are the first two books in Enid Blyton's exciting Adventure series. Island sees the children discover a secret island used by smugglers, and Castle involves them investigating a spooky, ruined castle that is being used by criminals. This title likely refers to a two-in-one volume, combining the first two high-stakes adventures featuring Philip, Dinah, Jack, Lucy-Ann, and Kiki the parrot.
