Dating Disaster - Star Girl, #3

After taking Sloane Slade under her wing, Rose Gardens is faced with the seemingly impossible task of teaching the quick tempered teen how to be a hero, without accidentally turning her into the next terrifying supervillain of Century City. But superhero school comes to an abrupt halt when superhero reality rears its ugly head: the mystery of Rose's murderous boyfriend from the future is a ticking time bomb that's set to go off any minute, and every minute Rose spends away from cracking the mystery of how the love of her life transforms into the man who would see her dead is one minute closer to Rose meeting that unfortunate fate.
Disaster looms on the horizon of Rose's life and when a superhero's life turns into a disaster, the rest of the world isn't too far behind.