In 2002, the psychiatric hospital at Lopača, near Rijeka, started admitting children with behavioural disorders. Soon, controversial stories about the hospital’s treatment of children began to spread. This public secret is finally revealed in the painful testimonies of former patients, their parents and the doctors of Lopača Hospital. The film asks questions about moral responsibility, confronted by the shocking conformity of the hospital staff and the structures of the city government. In a reference to a Chinese proverb about three wise monkeys who ‘hear no evil, see no evil, speak no evil’, a definitive answer to the question ‘who is the fourth monkey?’ is finally revealed.