Sci-fi legend Brian Aldiss' dark and compelling story of Siamese twin boys with a third dormant head. Tom and Barry are Siamese twins with a third head growing out of Barry's shoulder. They are plucked from their deprived home by showbiz entrepreneurs and form a rock band, The Bang Bang. But the twins have a violent relationship and jealousies arise over their shared lover. Can a band split up when the singers are permanently joined together?