Dream Angus, by Alexander McCall Smith
When I read Baba Yaga Laid an Egg last month, I found out that it was part of this "Myths" series. Then I was at the library and happened to pass the McCall Smith shelf in fiction, and I remembered that he'd written one too, so I looked for it, and there it was--Dream Angus. McCall Smith explains that Dream Angus is Celtic deity, a very old one, and he is the god of love and youth and beauty, giving dreams of a person's true love and making people fall in love with each other.
This very short book--it's not exactly a novel--tells the Celtic myth story of Dream Angus, son of the Dagda and a river nymph, interspersed with parallel Angus stories set in the current day, or in the fairly recent past. There's a newlywed couple on a ferry, a boy whose beloved older brother is going to leave home, a woman who left her husband when she discovered his affair, another woman whose brother solves--sort of--a problem with her disaffected teenage son.
I enjoyed it very much. It couldn't be a much faster read, but it stays in your mind.