Coleman will be joined by Top of the Lake actor Ewen Leslie, who will play her husband Alistair.
Not unlike the last BBC drama about missing children, Child in Time, the storyline will follows two parents struggling to keep their lives and marriage together in the face of unthinkable tragedy and perverse public scrutiny.
Four-part thriller has been written by Jacquelin Perske, adapted from the 2013 novel by Helen FitzGerald. Filming, under the direction of Glendyn Ivin, is set to take place in Australia and Scotland.
Coleman said: "I first read Jacquelin Perske's script on a plane, it felt like walking a tightrope, racing page to page, unsettling, unknowable, uncomfortable, and thrilling."
|What||Jenna Coleman to play mother of missing child in BBC drama|
|Where||BBC One , BBC One | MAP|
On 31 Oct 18, Air and date times TBD