Sleepwalker (Harbinger #1). Harbinger, #1

An Evans Pack story.*Although this trilogy can standalone, you might prefer to read the Cursed series first to find out more about the secondary characters.*Margo's got a secret-she just doesn't understand what it is. But if she doesn't figure things out soon, she could jeopardise her family's fresh start. Dorian's a weak wolf in a dominant pack, and if he doesn't find a way to be noticed, he could be separated from his beloved guardians to make room for a younger shifter once he turns eighteen.
Two teenagers are running out of time when a string of murders drags them into danger. If they team up, they might find the murderer-unless he finds them first.