Home is Where You Are — Catherine Lievens

Ari is a merman who lives near Muir Beach, California. When he saves his only human friend from drowning, his existence becomes public knowledge, and he's taken away from his home to be used as an attraction in an Orlando aquatic park.

Theo Delaney is human, and as soon as he finds out about the merman, he's fascinated by him. He visits the park and decides Ari isn't a fish like the park's owner is trying to convince everyone. When one of the park workers tells him he's going to try to free the merman, Theo wants in, and he's the one who drives Ari back to California.

He hadn't expected to fall in love in the process, though. How can he, a human man, and Ari, a merman, be together?