Summer Lightning — Wendy Corsi Staub

From a New York Timesâ€"bestselling author, a teen falls for her ghostly protector and must choose between him and her real-life boyfriend.
 
Melissa Loring appears to have it all -- generous parents, great friends, a devoted boyfriend. Tripp is nothing short of amazing -- kind, athletic, and one of the most popular guys at school. Not to mention hot. So why does Melissa find herself longing for someone else? Sometimes she even dreams about an invisible guardian watching over her, someone who cherishes her with the kind of all-consuming love she longs for.
 
On her seventeenth birthday, her wish is granted. First as a voice, then as a shadowy image on her computer screen, Schuyler Whitfield reveals himself to be her protector, a boy who loves her beyond her wildest imaginings. Only problem? Schuyler is a ghost.
 
And yet, Melissa is drawn to him like no other. And soon she must make a choice between her otherworldly suitor and her all-too-real boyfriend. But choosing someone from the other side to be her true love is a big step. Because there's only one way to be with a ghost forever . . .