Basil knows he's special -- he's been associating numbers with colors since he was a kid. His "gift" (or curse) as turned him into somewhat of an outsider, but his world changes when he meets Tenzie, the new girl in school. She, too, has synesthesia -- a neurological condition in which one type of stimulation evokes the sensation of another. At first, Basil is somewhat annoyed by Tenzie's pushiness, but after Basil's estranged mother returns, his life is turned upside down, and Tenzie may be the only person to help him put it right again. Much to their surprise, their synesthesia ends up bonding them in more ways than they can imagine.