Valeria - The Ventura Series, #1

Rogue and Ranger are twin sisters who have inherited the family estate. Ventura is a warren of endless halls and passageways on grounds covered in hills, forests and quiet, sandy bays. It is a paradise. Or so they thought. Things have changed since Rogue and Ranger explored Ventura as children. From the moment they cross the threshold they are plagued by a dark presence, stalked by one who would claim Ventura's treasures for themselves. Ventura is hiding ancient secrets, and an evil seeks to claim them for itself.
Rogue and Ranger are in a race against time to find the answers hidden in their family's history and when they do, it is more than they ever could have imagined. Romira Royce, their ancestor and powerful sorcerer, built far more than Ventura Estate. The worlds he created are in danger of being lost to the darkness overtaking the estate and the only way to stop it is to reunite the Heart of Ventura. But.
it is pieces across the Venturan Universe. Join Rogue and Ranger on their journey through the worlds of Ventura, meeting all manner of creatures in their attempt to find the Guardians, those charged with the care of the Heart. Can they reunite it in time to save their home?