Eddie feels invisible – his sister Scarlet isn’t well and nobody seems to remember that he’s here. Out in the forest, as the ice hardens and winter gets deeper, the world is quiet. But there’s a monster deep among the trees – a monster that’s growing with every sad and angry thought Eddie says out loud.

When a little red bird takes him to meet Mari, a strange and fierce girl with blurred edges just like him, she shows Eddie how to be loud, how to make new friends at school and enjoy the music he loves again. As Scarlet’s big operation approaches and Eddie gathers his courage to finally be heard, will he find his way back through the snow and put the monster to rest once and for all?