When a businesswoman (Emma Fielding) is kidnapped in South Africa, expert hostage negotiator Dominic King (Trevor Eve) believes he's dealing with a straightforward case – pay the money, get her back. But when the release is botched and they strike again in Britain, the kidnapper, Willard's (John Hannah) motives become far more sinister. With trouble brewing at home with his wife Sophie (Natasha Little) and teenage daughter - and his team, boss Angela (Helen Baxendale) and ambitious assistant Carrie (Amara Karan) pushed to the limit, King must draw on all his reserves to bring the victims home alive.