From the murky depths of the Shining Sea rises a pre-historic menace who commands a rising tide of invasion to crash over the shores of . Iakhovas has plotted for long, bitter years to regain the powers that were torn from him by an angry goddess. Now, nothing will stand in his way, and the face of Toril will never be the same again. Oblivious to the growing danger of the undersea civilizations, the surface world is about to awaken to a new, horrifying threat from the sea.

The sea war rages up and down the Sword Coast, leaving the busy harbor of Baldur's Gate in flames. Following his mad quest, the evil Iakhovas has found a gateway into the protected waters of the Sea of Fallen Stars, and now no coast is safe from his marauding armies of the deep.

Iakhovas has caused more destruction than any force since the Time of Troubles, but his true objective has been a mystery . . . until now. When a young sailor's journey is complete, an aging bard's final song is sung, and a malenti priestess faces her most challenging test, the Threat from the Sea concludes in an explosive climax that will set all of Faerûn reeling.