British acting duo Emma Thompson and Jim Broadbent have signed up to star in the 3-part Agatha Christie adaptation ‘Why Didn’t They Ask Evans?.’

Thompson and Broadbent, who will play British aristocrats Lord and Lady Marcham, will join Lucy Boynton who takes on the role of their daughter Lady Frankie, Will Poulter as Bobby Jones and Hugh Laurie and as creepy sanitorium director Dr. James Nicholson.

Based on Christie’s 1934 mystery, the story centres on the local Vicar’s son, Bobby Jones (Poulter), and his whip-smart friend, socialite Lady Frances ‘Frankie’ Derwent (Boynton) on their crime-solving adventure after they discover the crumpled body of a dying man who, with his last breath, gasps the cryptic question of the title.

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Armed only with a photograph of a beautiful young woman found in the dead man’s pocket, these amateur detectives pursue and are pursued by, the answer to the mystery.

As well as starring, Laurie will also direct. Maeve Dermody (“The Secret Garden”), Conleth Hill (“Game of Thrones”), Daniel Ings (“I Hate Suzie”) and Jonathan Jules (“Small Axe”), along with Miles Jupp (“The Durrells”), Amy Nuttall (“Downton Abbey”), Alistair Petrie (“Rogue One: A Star Wars Story”) are also set to appear, alongside Paul Whitehouse (“The Personal History of David Copperfield”), Morwenna Banks (“Skins”) and Joshua James (“Black Mirror”) will also star.

The mini-series will hit Britbox in 2022.