With Heorot saved from the menace of Grendel, Beowulf can finally leave and get back to adventuring. Except the night before he leaves, the king's advisor is abducted as revenge! Even something as monstrous as Grendel had a mother, and she won't rest until all of the Danes have been slain. So Beowulf dons his armor and seeks out Grendel's mother in her lair, beneath a fetid lake filled with water like acid and so deep no human has ever seen the bottom.
