Legendary literary game-maker Garrison Griswold is back in action—this time with "Unlock the Rock." For this latest coup, Griswold has partnered with the notoriously reclusive mystery writer Errol Roy to plan an epic escape-room challenge on Alcatraz Island. But just as the fun starts for Emily and James, they realize they've become a target. Threatening notes, stolen items, and a vicious plot to frame Emily's brother, Matthew, emerge to sabotage the sleuthing duo—at any cost.

Now the friends must find their invisible enemy as they compete in Unlock the Rock, and both mysteries will pull them into the perilous Alcatraz underground. With Matthew's record on the line, Emily and James can't afford to leave this enigma uncracked... but first Emily must find a way out of the prison dungeon.

From the dust jacket