The eight-part series is written and created by Stephen M. Irwin and Leigh McGrath, and is produced by Hoodlum Entertainment.

Tidelands follows the story of Cal McTeer, who served ten years in prison for an alleged murder while a teenager.

[3] She encounters a group of dangerous siren–human hybrids called "Tidelanders", the result of occasional sexual relations between sirens and marine fishermen, while exploring the mysterious appearance of a fisherman's corpse.

[5] The plotlines pit the Tidelanders, who largely occupy a communal settlement ruled by a matriarch, Adrielle Cuthbert, with the Orphelin Bay townspeople, many of whom are well aware of the Tidelanders' origins and power over centuries, and of the existence of the secretive and rarely-glimpsed sirens.

Much of the filming took place in and around Moreton Bay, close to Brisbane in South East Queensland, Australia.