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This absorbing thriller, Siren, which starts with a double bill, follows a strange woman, Ryn, whose arrival sends shockwaves through a US coastal town, not least for marine biologist Ben (Alex Roe), whose ancestor is rumoured to have had a complex relationship with mermaids.

It soon becomes clear that Ryn is a mermaid herself, with a rather strong killer instinct, and she may be in need of Ben’s protection…