Hayden Keyes is back in the second thrilling installment of Hayden and the Knights! A lot has changed since Hayden pulled Excalibur from the stone last year during the Battle for the Magic Hollow. It turns out that owning a legendary sword is kind of like carrying around a monster-homing beacon everywhere you go. Not pleasant. Fortunately, Hayden's become something of a monster slayer and doesn't have much to worry about. At least until Excalibur's power starts to falter, that is. When a mysterious poison pollutes the Lady of the Lake's magical waters, the Knights of the Round Table must band together more than ever if they hope to fend off this evil before it irreversibly destroys their home. Without the full power of Excalibur on his side, Hayden starts to wonder if he is strong enough for the task. Reunite with all your favorite characters in this epic adventure which takes you far beyond the protective walls of the Magic Hollow and deep into the wilds of Between as Hayden and his friends depart on a quest for the fabled Heart Spring at the Origin of Magic.