Who are the 137 children missing in Ireland since 1977?

Mary Boyle, Kyran Durnin, Philip Cairns: Three high-profile cases of children who went missing in Ireland.
Some of the faces stare out from the computer screen, their pose capturing a moment in time when their future was bright, when dreams were waiting to come true.
For others, the screen shows solemn young people whose mugshots were meant only for passports. These images form the missing persons files of the gardaĂ and Interpol.Â