Ephraim Appledore-Smith is an ordinary boy living an ordinary life. But everything changes when his father has a stroke and his family moves back to their ancestral home, the Water Castle. There Ephraim meets Mallory Green and Will Wylie, whose families are tied to the Water Castle’s powerful secrets . . . including the legend that the Fountain of Youth is hidden on the estate grounds. When Ephraim learns of the Fountain, he's sure it can cure his dad. With Mallory and Will's help, he embarks on a quest that will reveal ancient secrets, resurrect old feuds, and leave readers wondering: Do you believe in the unbelievable?