Little Boy Lost - S11.E7

Greig leads the manhunt when a young boy is taken by his stepfather after his mother refuses the man access. Stamp and Ackland report that they saw the boy earlier that day. When Stamp and Ackland find the boy dead, the stepfather tries to explain that it was purely an accident, with the boy haven fallen when he tried to show him the location where he and his father used to go fishing as a child.