A saboteur is loose on the film set of the WW1 BBC production of the book A Skylark Sings. The motive is obvious from the start, but the perpetrator is not so easily identified. The saboteur baits the police before ramping up the number and severity of incidents, putting lives at risk. After actor Alex Ward and his girlfriend, Elisabeth Ireland, save the life of the executive producer from his car after his brakes are cut, they become the targets for the saboteur's fury. Lives lived in 1916 are now brought back together for either good or ill as the past catches up with the present, but who will survive the encounter this time around?