River of Flames by Lydia Reeves

It’s the opportunity of a lifetime—a coveted spot on the prestigious archaeological dig in Velarta. It has everything River could want: a view of the Baltic Sea, a gorgeous yet mysterious Italian archaeologist, and a chance to one-up her lifelong best friend and rival, Theo. So what if the locals say the dig site is cursed?
River doesn’t believe in any of that nonsense…until a mysterious artifact is unearthed and everything begins to change. Suddenly things are happening that River can’t quite explain. When she wakes up in a field with blood on her hands, she knows she can’t ignore it any longer.
With help from Theo and the mysterious Luca, River embarks on a quest to find out what’s happening before she loses herself completely. But in Velarta, asking questions might give you answers you don’t want…