On a wintry Friday night in 1986, a 14-year-old boy wakes up in his home in the Jerusalem neighborhood of Ein Karem. He takes the M16 rifle his father brought home from the army reserves and shoots his parents and two sisters in the head at close range. Then he gets dressed and runs to the neighbor's house. When the police arrive, the detective asks him why he shot his family. The boy replies that a green creature has ordered him to do so. Hundreds of psychiatrists from Israel and beyond are trying to decipher this heinous act, but none of them can come to a clear conclusion. Insiders have their say in this docuseries.