Prot is back and patient Robert has returned to a catatonic state on the ward at the Manhattan Institute of Psychiatry. This visit to Earth, prot promises, will be his last and so Dr Gene Brewer has limited time in which to unravel the mystery of his most special and famous patient and enlist his help in recalling Robert to live. But around him the excitement turns to hysteria as prot's charm and influence on the other patients and on the world exert themselves. Prot now claims that he will be taking one hundred beings back with him, when he leave for his home on the perfect planet, K-PAX, and everybody is clamouring to be chosen.