North Star

According to Greek mythology, the first humans were created with four arms, four legs, and four eyes. Zeus, fearing that they would one day take his place as ruler, split each human in half and left them to wander aimlessly around the mortal world searching for their other half, their Soulmate.
Selene and Caralye are Soulmates-they just haven't found each other yet. Every single human on earth is born with a tattoo of a seed on the inside of their wrist-but it's no ordinary tattoo, it's a Soulmark. On the day of a person's eighteenth birthday, the seed starts to grow into a tattoo of a plant, a tattoo that will act as a compass, leading a person to their Soulmate; the more it grows, the closer it a person is, to finding their other half. But there's a catch-if you don't find your Soulmate by your 21st birthday, you and your Soulmate will die. With the help of their tattoos and cryptic dreams that link them, Selene and Caralye set out from opposite sides of the world to find each other-before it's too late.