Where the Tide Lines Lead

<p>Elio''s family owns a successful holiday resort on the Spanish coast, but when multiple teenagers go missing in?suspicious?circumstances, bookings across the town dry up. Then?Elio?witnesses something strange <i>- </i>the sea parting for a teenage girl, before carefully enveloping her. <br><br>Unsurprisingly, no one on the island believes Elio. But a few days later, Sam, a British tourist, comes to find him. Her older sister Jess is one of the missing teens, and Sam thinks Elio''s story could be true. <br><br>As they investigate, they too are pulled into the water and discover an underwater city ruled by selkie-like creatures. The beings are in desperate need of Elio and Sam''s help, but why have they been taking teenagers, and can they really be trusted?</p>