Once Every Never by Lesley Livingston

Clarinet Reid is a pretty typical teenager. On the surface. She’s smart, but a bit of slacker; outgoing, but just a little insecure; not exactly a mischief-maker… but trouble tends to find her wherever she goes. Also? She unwittingly carries a centuries-old Druid Blood Curse running through her veins.

Now, with a single thoughtless act, what started off as the Summer Vacation in Dullsville suddenly spirals into a deadly race to find a stolen artifact, avert an explosive catastrophe, save a Celtic warrior princess, right a dreadful wrong that happened centuries before Clare was even born, and if there’s still time—literally—maybe even get a date.

This is the kind of adventure that happens to a girl once every… never.