The three-part mini-series has been co-produced by Spanish TV network TVE, and will be set in a luxurious resort on the Canary Islands.
Crossfire is set to be an emotional, unsettling watch as a split second changes one holidaymaker's life forever.
Jo - an ordinary woman holidaying in Gran Canaria with friends and family - hears a blood-curdling noise while sunbathing on her hotel room balcony.
Gunshots begin to ring through the building, transforming the place from dream destination to terrifying torture chamber in the space of a split-second.
Once-unsuspecting tourists are forced to make instantaneous decisions in order to save the lives of themselves and others. This promises to be a truly nail-biting watch!
Lee Ingleby (The A Word), Anneika Rose (Line Of Duty) and Hugo Silva (The Cook Of Castamar) are also set to star in the series.
Keeley has confessed that she's "excited to be embarking on this brilliantly compelling and propulsive drama for the BBC".
First-time TV writer Louise Doughty is also part of the project, alongside director Tessa Hoffe and producer Alex Mercer.
Keeley is perhaps best known for her role in Bodyguard, where she plays Julia Montague, MP.
Fans of the series have got a lot to look forward to next year, as the production company behind the title (as well as Line Of Duty) have been working on ITV series Trigger Point.
Vicky McClure will be starring in the edge-of-the-seat drama, as a member of the Metropolitan Police Bomb Disposal Squad who previously fought in Afghanistan. Merlin's Adrian Lester will star alongside her in the series.
Twitter users are hugely excited for Crossfire to come out, with one person saying it looks like an "awesome" watch.
Hurry up, 2022!
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