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Sleuthing duo Emily and James tackle their most challenging mystery yet set on the haunting Alcatraz Island in Book 3 of the New York Times bestselling Book Scavenger series! Legendary literary game-maker Garrison Griswold is back in action-this time with "Unlock the Rock." For his latest game, Griswold has partnered with the famous--and famously reclusive--mystery writer Errol Roy to plan an epic escape room challenge on Alcatraz Island.