Arriving in a more rural Hill Valley, Marty hid the DeLorean behind the billboard advertising the development of Lyon Estates.He is one of the few American journalists left in Phnom Penh when the city falls to the Khymer Rouge guerrillas in 1975.Robert Riskin""s screenplay was based onThe American Magazine""sserial storyOpera Hat[the initial itle of the film] by Clarence Budington Kelland, appearing in he April to September 1935 issues.Subsequently, the disturbed, psychotic boy was institutionalized for the crime for 15 years in Smith""s Grove, Illinois at the Warren County Sanitarium, observed by quirky psychiatrist Dr.