Not to be confused with the Disney cartoon "The Little Mermaid," this 2018 film is based on Hans Christian Andersen's mermaid tale. Cam (William Moseley) and his young niece Elle (Loreto Peralta) discover a mermaid named Elizabeth (Poppy Drayton) trapped in a tank at the circus. Supposedly, her water heals all ailments, which Cam hopes to use for Elle, who is sick. However, he fears it's not true and that Elizabeth isn't actually a mermaid, especially when he meets her again in the woods. But while the mermaid water may not be working as planned, Elizabeth truly is a mermaid who is trapped, and Cam and Elle can help her find a way out.