This is the first book of the Guardian WIT series  

B.L. Pleisch.

    Marna Farlow’s life is about to change. A phone call in the middle of the night holds a call to action to save her twin sister’s children from an unknown threat. Unfortunately, it also relates to the fact that she could not save her sister. “It’s too late for us, but you must save the children!” Amanda cries.
Marna and her husband Jeff answer the call. However, when they arrive at the small traditional farmhouse, there is no life within the walls. They find the body of Amanda, her husband Pete, and their friend Rice. Another body found on the property was the body of their pediatrician.
Following the clues, Amanda leaves behind. They find her eight children in a small panic room at the back of the house.
    No sooner do they find them; someone threatens their very lives and those of the children. They escaped, but that was only a minor incident in what they must face in the violent world of one madman determined to control Marna and Amanda’s children. They possess powerful psychic abilities and together a collective that is more powerful than any other.
    Marna must accept who she is and what she can do to save herself, the children, and others, against a threat so destructive it could change the world forever.