Seventeen-year-old Veronica “Ronnie” Lambert wants to get out from under her older brother’s shadow. When Ronnie gets a tattoo and then is struck by lightning, she suddenly finds herself able to see and hear things in shadows that don’t appear to others. Then Ronnie meets Gavin Clearwater, the hot new guy in all of her classes and finds out he can see and hear the same things she can.

Gavin tells her about the Spiral Defenders, a group of warriors that travels through space and time to defend the planets of the Spiral. After meeting the Commander of the Spiral Defenders and realizing his intentions might not be pure, Ronnie struggles between following her destiny to become a Spiral Defender and trying to regain the life she had before being struck by lightning.