Chris Carson (Martin Freeman) is struggling - every night he drives a police response car in the city of Liverpool, dealing with everything from warring neighbours to druggies, and he’s also suffering from a breakdown brought on by stress at work, and wants to leaves his marriage.
His wife, Kate (MyAnna Buring), offers to pay for more counselling, but Chris rejects her help preferring to sort his own problems out, even though he is reaching breaking point.
When an old school friend, Carl Sweeney (Ian Hart), asks him to help find a young heroin addict called Casey (Emily Fairn), Chris uses his local knowledge to locate her in a hideout in an alleyway.
But when Casey tells him that she has stolen a bag of cocaine and may be in danger, Chris offers to help, seeing a path to redemption in the young woman - if he can save her, perhaps he can save himself.
Carl is furious with Chris for helping Casey escape - the bag of drugs that Casey stole isn’t actually his, and if Chris can’t help Carl find the bag, they are both in deep trouble.
The Responder begins Monday 24th January at 9pm on Channel 4.