This was one of the last two of this series that I had not read yet, although by no means the last in chronological order. Not that that matters very much with this series, but this one was published as volume five, and was the last one I read, and it's odd to think this grew on me so quickly after I had initially not liked one of these volumes when I read it a few years back and so never pursued the series! Now I'm sorry it's over, but I do understand Allison's desire to move on and try something new. I'm just sorry I didn't like what he did next.
In this volume, the author explores Selkies - mythological seal-like creatures that inhabit the ocean, but after casting-off their sealskin cloak, appear as human - and very pretty young girls some of them are, too. Due to Lottie's discovery of one of these cloaks on the beach, and her stuffing it into one of the boys' bags, the Selkie latches onto this boy and pursues him ardently, including enrolling at his school, where she poses a threat to the established swimming champion in the school, who is also threatened by her boyfriend dating one of the girls without telling her he doesn't want to date her any more. But wait, his ex is good-looking, and a great swimmer? What's going on here? Meanwhile the Selkie's dad emerges from the ocean in search of his lost girls and is immediately assumed to be a homeless guy!
Once again I was highly amused by this and I am sorry to see the series come to an end. I commend this as a worthy read.