Equus by Peter Shaffer

Self-consciously staging itself in the psychotherapy sessions of a disturbed young man, Peter Shaffer's Equus is a shocking exploration of the limits of faith, of the intersecting worlds of the sacred and profane, and of the paltry value of a 'mundane' life, published in Penguin Modern Classics. When a deranged boy, Alan Strang, blinds six horses with a metal spike he is sentenced to psychiatric treatment. Dr Dysart is the man given the task of uncovering what happened the night Strang committed his crime, but in doing so will open up his own wounds.