The Scorpio Races by Maggie Stiefvater
Each November the men of Thisby surrender to the power of the island's flesh-eating water horses in a vicious race that is certain to leave few standing. In an attempt to save her family's home, Puck Connolly goes against all odds and enters this year's race. Will Puck make it to the finish line or will the legendary Sean Kendrick reign in his 5th consecutive win?
This fast-paced novel will have you biting your nails until the very end. If the premise of flesh-eating horses does not draw you in, read this one for an adventure! Puck and Sean are characters you will remember long after setting this book down.