In Ireland a series of strange ditch like constructions are investigated to identify who may have built one of the largest promontory fort in Ireland. The Time team become almost overwhelmed by the amount of finds they make and what those finds tell us about the builders.  A previously unexcavated massive Bronze Age promontory fort conceals the remains of a sophisticated society.  Working with archaeologists from Queen's University in Belfast, the Team takes up the challenge to unlock the prehistoric secrets of the headland at Knockdhu, County Antrim.