Olivia Colman and Alison Steadman are set to star in new BBC One drama The Secrets.
The five-part series, each featuring "an explosive story with a secret at the heart of it", has been penned by new writers and will be broadcast later this year.
Stories in the Working Title Television production, directed by Dominic Savage, include monogamy, a police officer having an affair with his brother's wife and a bride who discovers on the eve of her wedding that her fiance was once accused of a shocking crime.
Broadchurch actress Olivia and Gavin And Stacey star Alison feature in an episode penned by Nick Payne, whose play Constellations, starring Rafe Spall and Sally Hawkins, was nominated for an Olivier Award.
The episode, which also features Steve Oram, tells the story of a vet expecting her first child, who has all the chemicals to put pets to sleep, and a mother who is chronically ill and wanting to die.
The other three writers are Elinor Cook, Ben Ockrent and Sarah Solemani, who played Rosie Gulliver in BBC Three comedy Bad Education.
Bafta-winning director Dominic, best known for True Love, Freefall and Dive, said: "I am delighted to be part of this new strand which really illustrates what the BBC stands for. Working with new and talented writers along with the best actors the UK has to offer is a real privilege and I can't wait to get started."