Channel 4 and the US streaming platform Hulu are joining together for Kiri, the new drama from BAFTA-winning writer Jack Thorne.

The four-part serial drama will follow the abduction and death of a young black girl named Kiri while she is visiting her biological grandparents before being adopted by her white foster family.

“My Mum spent most of her life in the caring professions and I’ve always wanted to find a way of examining the pressures they are put under,” said writer Jack Thorne (National Treasure; Glue; The Fades; This is England). “I’m so grateful as always for the bravery and brilliance of Channel 4 in being prepared to look these issues in the face.”

Sarah Lancashire (Happy Valley) will play Miriam – an experienced social worker with an instinctive approach to protecting the children under her care. When Kiri goes missing, the police, the press and her colleagues point the finger of blame at Miriam and, as the story intensifies, so does the media attention.

Beth Willis, head of drama for Channel 4, said: “We are so honoured and excited to have Jack return to Channel 4 for Kiri. Jack’s characters are uncompromising and contradictory and always utterly, recognisably human – his typical wit and warmth blass off the page right from the start. We are so thrilled to have the perfect Sarah Lancashire bringing the funny, bold and troubled Miriam to life.”

Lucian Msamati (Taboo; Luther) stars as Kiri’s birth grandfather, while Lia Williams (The Missing; The Crown) will portray her foster mother.

George Ormond, co-executive producer, added: “Following Miriam, Toby and Alice as their lives are put under the spotlight is utterly compelling, an emotional rollercoaster. It’s typical of Jack’s writing that it leaves you torn – you love them, and question them at the same time. We’re delighted to have attracted such a wonderful cast, and to be working with Jack again.”