In the wake of TT3D: Closer to the Edge (and, to some extent, Senna) comes another documentary about men willing to risk their lives in the pursuit of speed with consequences that veer from the celebratory to the tragic. Focusing on the Dunlop family, who variously dominated both the Isle of Man TT and Ireland's North West 200, this intersperses moving interviews with alarming race footage, some of it taken from the front of motorbikes as they tear around roads that present a life-threatening challenge to even the most skilful rider. The stories of death and glory are dramatic enough, without need of artificial enhancement. A shame, then, that this documentary is slathered in portentous narration by Liam Neeson and a ludicrously over-cranked and incessant score, both of which conspire to undercut, rather than enhance, the overall impact.