It’s not just hiding whether they’re really The Traitor that’s the only secret in Claudia Winkleman’s new game show.

In fact, two contestants are harbouring a bigger detail, the fact that they’re actually in a relationship.

The murder mystery reality show looks to be terrifying, nail-biting and already has us hooked, as 22 contestants move into a Scottish castle, and take on challenges to try and win £120,000.

The catch? Half of the contestants are actually Traitors, who will try and kill off one of the other group, The Faithful, but no one is sure who is who.

During Tuesday’s first episode, Claudia already dropped two contestants before the challenges had even begun, while we got to know some of the stars of the show – and realise just how many secrets they were keeping.

The contestants all met each other for the first time on their way to the Scottish Highlands – or so we thought.

Alex (R) hid a pretty big secret from Matt (L) (Picture: BBC)

The actress was already dating one of her contestants (Picture: BBC)

26-year-old actor Alex introduced herself to the camera: ‘To be honest, I’ve just come in here and I want to be myself, I think I’m a fun, nice person, I’d love to get involved.’

She then added: ‘I kind of want to be everyone’s friend, and I don’t want to get too close to anyone, because not only am I keeping the acting a secret, another a big secret I’m keeping is that my boyfriend is also in this game, Tom.

‘Yeah, we’re keeping that to ourselves,’ she said, as she flirted with Matt who all the contestants knew had ‘a massive crush’ on Alex.

‘It’s throwing the bait somewhere else,’ Alex said about flirting with Matt (Picture: BBC)

Tom praised his girlfriend’s ability to ‘play the game’ (Picture: BBC)

‘That’s my girlfriend, it’s fine, Alex is playing the game though, she’s good trust me,’ magician Tom told the camera.

Meanwhile Alex admitted: ‘We’re going to keep that top secret because if anyone sees us have an alliance, that would be awful, so I’ve flirted a bit with Matt, so it’s kind of throwing the bait somewhere else.

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‘It’s hard though, because I want to make sure he’s okay, tell him I love him, but I’m distancing myself and acting like I’ve just met him for the first time.

‘So far, I think so good.’

We’ll have to wait and see if anyone discovers their secret…

The Traitors continues tomorrow night at 9.15pm on BBC One.

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Two of the contestants are hiding a pretty big secret.