The Double Demigod

Evangeline, Peter and Tyrone didn't mean to destroy a priceless Greek vase. They also didn't mean to release a Greek demon that rained destruction on a Greek Festival and killed three people. They are now on the run from the authorities across the nation with powers they can't explain, encounters with things they can't explain, and constant dreams about a girl- urging them to find her before something bad happens. They must find the girl, maneuver a world of horse-men and humans with winged-shoes, and not get caught by the cops and somehow master their powers so they can live to see another day- Or at least another Maroon 5 concert.
(this is a percy Jackson fan-fic set in the Percy Jackson world but not about the actually main canon characters)