Hundreds of parents of kindergarten students at a prominent international school in South Jakarta assembled in a house at the Pondok Indah neighborhood last week. They listened attentively to a woman named Putri telling of sexual abuse committed against her five-year-old son, Leo. (Some of the names in this story have been changed.)

To the parents, mostly expatriates, Putri described changes in her son's behavior that alerted her to the incident.