A novelization of Joe Dever's Lone Wolf Gamebook #2: Fire on the Water. War rages across the realm of Sommerlund and the armies of Darklord Zagarna draw ever nearer to Homgard, the capital. In this darkest hour, only one power can save Sommerlund from its impending doom: the power of the Sommerswerd - the Sword of the Sun.

Lone Wolf, last of the warrior Kai, is sent by King Ulnar to retrieve this magical blade from the land of Durenor. But how can he hope to complete his vital quest and save his realm when the agents of Darkness are stalking his every move?