 DCI Ross Tanner and his deputy Catherine Tully are investigating the brutal murder of a 19-year-old boy. Among the suspects are a gardener who may have been supplying the boy with drugs, a live-in nanny who may have been having an affair with the boy, an overprotective mother whose new two-year old daughter may have put on strain on the mother-son relationship, a step-father whose work interfered with any intimacy with the boy, and an identical twin of the lastly named  suspect.  Tanner s skills are tested to the maximum because he is experiencing loss of vision and is hiding the fact until the case is resolved.