In the small fishing town of Orphelin Bay, a mysterious conspiracy of silence surrounds murder, drugs, and mythical sea creatures known as Sirens. When ex-con Cal McTeer returns to her hometown after a decade-long absence, she uncovers dark secrets lurking beneath the surface, putting her and the town's inhabitants in grave danger. As Cal investigates further, she must confront her own demons while confronting the treacherous world of half-human, half-mermaid outcasts who will stop at nothing to protect their way of life. The Tidelands are shrouded in mystery, but the truth cannot be contained forever.

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Some TV shows that have similar genres and were produced around the same time as Tidelands include Dark, The Boys, Marvel's Luke Cage, Gotham, Green Frontier, Wu Assassins.