Whisper of Memory — Brinda Berry

Weapons training and winter formals...a deadly combination. All Mia ever wanted was to fit in at Whispering Woods High. But being a portal-finder who dates a guy from another dimension sort of makes it hard. Mia's brother disappeared over a year ago, and agents from the IIA began policing people's movements through dimensions. She'd trusted Dr. Bleeker from the local university when he'd told her the IIA were the bad guys. But even a girl with an extraordinary ability to sense things can make mistakes. Now two people are dead, and as a portal gatekeeper for the IIA, Mia needs to find Dr. Bleeker before he hurts anyone else. And her boyfriend Regulus, an Agent for the IIA, carries secrets of his own. Between learning about weaponry, finding the perfect dress for the winter formal, and catching bad guys, who has time to fit in?