This is book number 1 in the Amulet series.
Bridget's Senior Year Checklist includes:
1. Hook the new guy, Trip
2. Hang with newly discovered cousin, Cay aka the most popular boy at OCHS
3. Find missing weather controlling Amulet
4. Pass SATs
5. Save the world
In her quiet Jersey Shore town, high school senior Bridget MacNamara just wants to get a date with the strikingly attractive new kid, Trip, but fate and her lineage have other ideas. Things get weird when the most popular guy in school, Cailean "Cay" McKay, won't leave her alone. Turns out they're distant cousins and what's more-they're the descendants of twin Scottish goddesses, Brighde and Beira.
The sisters originally shared an amulet that controlled the weather, and its sudden disappearance has sparked betrayal and vengeance, dividing the once-close family into two rival factions for the last few centuries. Bridget finds herself thrown into a modern version of Scottish mythology when she learns she's directly descended from Brighde, and Trip can be traced straight to Beira.
After a century of family warfare, Trip and Bridget are now a star-crossed couple, forced to fight both their families and each other in a race to find the missing amulet.
Wasn't senior year supposed to be a breeze?