Nate is Gray. Grays have no emotions, nor are they allowed to show emotion. But Nate wants to. He wants to smile, laugh, and cry. But he can't. Mat is Red. Reds know emotions like the back of their hand, and are known to sometimes convince Grays to become Blues. But when your mother is the Queen of the Grays, how can you become Blue without her knowing? And how can you love without it showing?