The Halfling's Gem (Forgotten Realms: The Icewind Dale, #3; The Legend of Drizzt, #6)

Regis has fallen into the hands of the assassin Artemis Entreri, who is taking him to Calimport to deliver him into the clutches of the vile Pasha Pook. But Drizzt and Wulfgar are close on their heels, determined to save Regis from his own folly as much as from his powerful enemies.