There's a killer on the airwaves... and they're calling for you. Darkness looms over sunny Sidmouth, when an unsolved murder comes to the attention of late-night radio talk show host Edward Temmis. Recently sacked from his beloved job after a devastating tragedy, Edward is cast adrift – until he meets Stevie, whose grandmother, a devoted listener, died in a suspicious fire last year. Well, nobody hurts his listeners and helping Stevie might just give him the purpose he needs. Joined by his old fling, Kim, they discover Stevie's grandmother wasn't the only one of his listeners targeted – this is just the tip of the iceberg. But who is pursuing his ageing audience and why? And can Edward, Stevie and Kim get to the bottom of this mystery before it’s too late?