From the front of the book:
Something in the forests of Deepingdale is driving the elves from their ancestral home. A black tree spews out disease and spawns shadow creatures that take over the woods. Will you be able to solve the problem in time? A Living Forgotten Realms adventure set in the Dalelands for characters levels 11-14. This is the second and concluding part of the Stem the Tide Major Quest, which began in DALE2-3 Swords from Plowshares.