In 1955, poet and artist Tobias Schneebaum traveled to the jungles of Peru to study painting. Soon after arriving, he apparently vanished into thin air. The U.S. embassy assumed he'd been killed, but seven months later Schneebaum reappeared with a disturbing tale of life among the Amarakaire Indians, a tale that included murder and cannibalism. Most shocking of all, Schneebaum admitted to having eaten human flesh. Some 40 years later, filmmakers David Shapiro and his sister, Laurie Gwen Shapiro, found a used copy of Keep the River on Your Right
, Schneebaum's 1969 memoir of his time among the Amarakaire, in a box of old books. Knowing a great story when they re...