Michael Lamb is a Father questioning his calling, in a Reform School in Ireland. When young epileptic runaway Eoin is sent to the school, the two recognise kindred spirits and escape to London together. With the police on their tail and the money running out however, Lamb is forced to make some terrible decisions.
"Lamb" focuses on the relationship between Brother Michael Lamb (Liam Neeson), a teacher in a Roman Catholic-run institution for troubled boys in Ireland, and 10-year-old Owen Kane (Hugh O'Conor), the school's most unruly pupil. Dumped into the institution by his abusive mother, Owen is an incorrigible mess who smokes cigarettes, curses, wets his bed, picks fights and has epileptic seizures.