Caiside Lithgow is a kelpie who has left his homeland, Scotland, to move to the United States. He meets Donald Hollins, a witch, in a local book store looking for a job. Donald's aunt, Bethel, decides to put Donald to a test - Figure out what mythical creature Caiside is within four months or he'll have to run and down the coast twice. No matter the out come, Caiside will be given a job and a place to stay. But with Caiside's habit of invading Donald's personal space, Donald is having a bit of a hard time focusing on figuring out what mythical creature he is and not crushing on the kelpie.