Mermaid Isle (2020)
Superfan 1 points 3 years ago. (Contains Spoilers)

This was a very bad movie. Slow pacing, badly written, and bad acting. None of the characters were smart. The old woman could have warned the main characters about the mermaids and Toby should have shot Amy before she turned.
With the short runtime they could have added mermaid backstory and shown the event in 1983.