The Conjuror (Orion Chronicles)

Sixteen-year-old twins Matt and Em Calder are Animare: they can bring art to life, and travel in time through paintings. They work for Orion—the Animare MI5—protecting the secrecy of their order and investigating crimes committed by their own kind. It's dangerous work. But when they are sent to Edinburgh to find a teenage boy who can alter reality with his music, they are drawn into something more dangerous still. For this boy, Remy, is the Conjurer's Son. And he carries something that could change humanity forever.