The Torchwood star leads a cast which includes Gabrielle Creevy, Emun Elliott and Clive Russell.

The BBC has commissioned a new Cardiff based thriller series starring Eve Myles (Hijack) and Gabrielle Creevy (In My Skin). They describe the show as an “… addictive, fast-paced story that centres on the toxic and beguiling relationship between a successful business owner, Fran, and her employee, Ria.”

The show, from writer Matthew Barry (Men Up), comes from Quay Street Productions (Nolly).

Here’s what we know about The Guest:

Ria has never had the time or opportunity to think about what she might actually want from the world. So, when she starts cleaning for Fran, she’s intoxicated by this confident and self-assured woman who encourages her to take control of her life and, when Ria flourishes, an intense friendship is forged.

However, when Fran’s advice leads to a shocking event, the lives of these two very different women become intertwined by shared secrets and dangerous plots. What follows is a compelling and manipulative game of cat-and-mouse. But just who is playing who?

Joining Myles and Creevy, the cast includes Sion Daniel Young (Lost Boys and Fairies) and Emun Elliott (Guilt). Plus, Bethan Mary-James, Julian Lewis Jones, Joseph Ollman, Clive Russell and Catherine Ayers.

Writer Matthew Barry says:

“I’m beyond excited to be re-teaming with Nicola, Davina and the whole team at Quay Street Productions and the BBC to bring The Guest to life. As well as being an exciting thriller, at its core this is an examination of class, social mobility and the growing disparity between those at the top and bottom of our society.”

The 4-part show is being made for BBC One and iPlayer, in a co-commission with BBC Cymru Wales. It starts shooting this month in and around Cardiff.

We’ll keep you posted on The Guest.