To celebrate the release of BBC Four's Danish thriller series Below the Surface, we've got two copies on DVD to be won.

Closing date: 06/05/2018

terms & conditions

1. This competition is only open to UK residents, excluding BOOM's friends and family and anyone else directly associated with this promotion.

2. The prize is a copy of Below the Surface on DVD. We have two copies in total to give away.

3. The winner will be drawn at random from all the correct entries, and only they will be contacted personally. The prize must be taken as stated and cannot be deferred. There will be no cash alternatives.

4. One entry per person - and yes, we will check. If we find that you have entered multiple times, we will disqualify you from this competition. Repeat offenders will be disqualified from entering future competitions. And we don't like robots, so we investigate multiple entries and entries suspected as being from robots will be deleted.

5. Closing date for entries is midnight on 06/05/2018.

6. Winners will be notified within 7 days by email. If a winner does not respond with their posting details 7 days after we sent them the initial notification email, their prize will be offered to another person following a subsequent further draw. This process will repeat until somebody responds and tells us where to send the prize. If you're entering, please remember to check your emails!

About Below the Surface:

This thrilling eight-part series comes from creator Kaspar Barfoed, whilst BAFTA award-winning writer/creator of The Killing Søren Sveistrup joins fellow BAFTA winner and Borgen creator Adam Price and A Royal Affair producer Meta Louise Foldager Sørensen as fellow executive producers.

On a rainy October morning, fifteen Danes have their lives turned upside down when the metro train they are travelling on is hijacked by unknown perpetrators, who will threaten to kill each of them, one by one, if their demands aren’t met. This is the beginning of a historic hostage situation that, over the course of one single week, changes Denmark forever. The politicians argue whether or not to negotiate with terrorists. In the press, there are discussions on where the line is drawn in portraying the captives and seeking out their families. Ordinary Danes are left thinking that it could have been them. Among the hostages, the thoughts vary between rebellion, negotiation and apathy, but one thought is shared by all: “Am I going to die now?”