The youngest of King Triton’s daughters, and the most defiant, Ariel longs to find out more about the world beyond the sea, and while visiting the surface, falls for the dashing Prince Eric. With mermaids forbidden to interact with humans, Ariel makes a deal with the evil sea witch, Ursula, which gives her a chance to experience life on land, but ultimately places her life – and her father’s crown – in jeopardy.

When the plots of reclusive author Elly Conway’s fictional espionage novels begin to mirror the covert actions of a real-life spy organization, quiet evenings at home become a thing of the past. Accompanied by her cat Alfie and Aiden, a cat-allergic spy, Elly races across the world to stay one step ahead of the killers as the line between Conway’s fictional world and her real one begins to blur.