Roxy Hunter and the Myth of the Mermaid, on Nickelodeon
Dolphin Entertainment; IMDb; Sony Pictures; Wikipedia

This is the third movie in the Roxy Hunter series, following The Secret of the Shaman. I may have been aware of it when it first aired in 2008, or I might not have heard of it until a few years later. Anyway, I didn't manage to see it on TV, but I did eventually see it on DVD, in 2016.

It begins with a couple of guys with French accents in a truck, when the back door opens and a barrel falls out into the lake they're driving past. They stop to look for the barrel, but can't find it. However, one of them, Dessie, thinks he sees someone under the water. Throughout the movie, they'll search for the missing barrel and the person Dessie thinks he saw. Meanwhile, Roxy learns of a journalism contest being run by a local newspaper, with a prize of $300. She decides to write a news story, but has trouble finding anything newsworthy happening in Serenity Falls. Then, while she's at the cafe where Ramma works, a chef from a fish & chips restaurant named Mr. Kyoto stops by. He informs Roxy that the police had found a mysterious girl with no clothes and no ID, who also appeared to be a mute amnesiac. So she goes to investigate, and subsequently tricks her mother into letting the young woman- whom she calls "Annie Nonymous"- stay with them, rather than let the police send her to a psychiatric facility. Meanwhile, Max is now working for the mayor. And there's a former local sports hero named Kip who has returned to his home town to seek funding from the bank for a proposed golf course. He takes an interest in Susan, which makes Jon jealous.

Well, I think that even without knowing the title of the movie, it would have been easy to predict based on various clues that Roxy would eventually come to the conclusion that Annie was a mermaid. So I'm a bit surprised that it was at least halfway into the movie before she came up with that theory. Meanwhile, Ramma falls in love with Annie because of her siren-like singing. (Oh yeah, some time before Roxy came up with the mermaid idea, she realized that Annie could sing wordless melodies, even if she couldn't talk.) And eventually all the disparate plot threads tie together. I guess that's all I want to divulge of the plot. But it's a fun movie.