Sea of Shadows by Kelley Armstrong

The book was a slow burn, but once it started going, I could NOT put it down. It had all of the things that I like in a fantasy: magic, mythical beasts (like super awesome ones: giant Thunderbirds, acid-spitting Death Worms, & zombie-esq Shadow Stalkers), and super-awesome female leads. That's right TWINS!! Cause what makes a kick-ass main character kick-assier? Two of 'em! Plus when you have two great main characters, you also get two HOT love interests (this is a YA novel after all, why not)! 

Final Recommendations: if you like fantasy, a little bit of magic, unique mythical creatures, animal companions, epic treks, sassy female heroins, a little bit o romance