The harp and the ravenvine - Ted Sanders

In the world of the Keepers, it's best not to speak in terms of the impossible. Horace F. Andrews, Keeper of the fabled Box of Promises, knows that nothing is impossible.
After all, he has the ability to see into the future, and his friend Chloe can walk through walls.
But before either of them can master their Tan'ji (their talismans of power) a new threat looms over all the Keepers, and they must prepare to battle their eternal enemies - the Mordin. But far away, drawn by an irresistible summons, a mysterious girl is making her way to the Keeper stronghold.
She wears the beautiful and delicate Ravenvine, but this Tan'ji is damaged and there is no telling what will happen to its power or its Keeper if it cannot be made whole again. Will April reach the Keepers in time? And will they truly offer a safe haven - or only more danger? Ted Sander's magical series began with THE BOX AND THE DRAGONFLY and continues with this powerful sequel that expands the extraordinary world of The Keepers, where nothing is ever ordinary and three words rule:
Curiosity.
Discovery.
Possibility.