Babies are born with a Crest on the inside of their right hand. It could be a star, yin yang, a lily, anything. No one else has the same Crest. No one except your soulmate. At some point in your life, the Crest will begin to glow. That starts a countdown. For 17 days, the Crest will glow and you and your soulmate will be able to speak telepathically. After the 17 days, the Crest will disappear if you didn't find each other, and you'll be apart forever.