On a cold February afternoon in 1990, seven-year-old Danny Redpath disappeared from his home. Four months later, his body was found in the nearby forest, wrapped in a sheet and washed clean of all evidence.

Apprehended while attempting to abduct another child, Jonathan Egan-Walsh was charged with the murders of more than a dozen boys. Convicted on all counts, he received life in prison and went unrepentant, still refusing to reveal the whereabouts of one of his victims, Zachery Marshall.

Twenty-five years later, Zachery’s mother Diane is still searching for his body. When Jonathan dies in custody, she realises she will never know its location – until she receives a letter he left in his cell, in which he admits he was guilty of all the crimes of which he was accused, except the murder of her son…