The keeper and the Alabaster chalice

Black Ledge is inhabited again, but not everyone in the house is pleased. As the Driscolls settle into their new home, they meet magical Beings, discover secrets, and exasperate to the Elven Guard. They're having a great time. Charm turns to alarm when they meet Doris, the Acadian Water Witch, who's removed the Alabaster Chalice from its watery grave. The Noctivagi, drawn by the artifact's Water Magyk, seek the Chalice for their own nefarious purpose, and mayhem ensues. Eleanor, Rob, Jack and Flora fight time and the tide to return the Alabaster Chalice to the Undine Prince before the darkness steals it.