Anthony Andrews plays a young Lt. in the early days of World War II who is assigned to a UXB unit. UXB is the signal that an aerial bomb has not exploded. Andrews' job is to deactivate bombs made by German technicians some of which have fuses specifically designed to kill him. The series takes us through his maturation as an officer, a love story with Judy Geeson, and the stresses and strains of wartime on the civilians and military in England. 二战期间伦敦遭到德军狂轰滥炸，但很多炸弹在落地之后尚未爆炸。是军官Brian Ash带领一个排雷小组在伦敦排弹的故事。