Hidden / Craith has begun filming in Snowdonia, Wales, and will air on pubcasters BBC Wales and S4C next year.
As with Hinterland, which All3 sold internationally, versions are being filmed back-to-back in English and Welsh.
Hidden follows a detective who returns to north Wales to care for her ailing father, only for her world to change when the body of a young woman in found in a local river.
Severn Screen is producing the show, which is from Mark Andrew, Ed Talfan and director Gareth Bryn, all of whom worked on Hinterland. Hannah Thomas is producer, with Andrew, Caryl Lewis and Jeff Murphy among the writers.
Hinterland alm Sian Reese-William and Sion Alun Davies are among the cast, which also includes Rhodri Meilir and Gwyneth Keyworth.
“I know from the experience of shooting Y Gwyll/Hinterland in mid-Wales how important the landscape can be in helping to define a series,” said Talfan, Severn Screen’s creative director.
“I fully expect the breath-taking landscape in and around Snowdonia to stamp itself on this series in the same way.”
BBC Wales head of commissioning Nick Andrews said the show would deliver “another slice of extraordinary drama”.
S4C drama content commissioner Gethin Scourfield said: “With a highly celebrated writing and production team and the dramatic Snowdonia scenery as a backdrop, Hidden/Craith is a series that will set your pulse racing.”
All3 will have international sales rights. “We are confident that the success of Hinterland has paved the way for high quality Welsh crime drama to travel well beyond its national borders,” said Maartje Horchner, executive VP of content at All3 International.
In 2014, TBI revealed Hinterland had become the first UK-produced drama to sell to German pubcaster ARD in several years.