Here's the back cover blurb for Darkness Descends:
tell will, I’m coming…
The voice is deep, ominous, male.
Her dream knocks me breathless. I’ve learned never to take Cassie’s dreams for granted. Too many of them have almost come true.
Will Rossi made two promises to the girl he loves:
to keep her secret
and to keep her safe.
After meeting other teens with psychic abilities, Will is determined to discover their origins.
But in order to keep his promises, he must risk everything.