Stella Cross's heart is poisoned.

After years on the transplant waiting list, she's running out of hope that she'll ever see her eighteenth birthday. Then, miraculously, Stella receives the transplant she needs to survive. Determined to embrace everything she came so close to losing, Stella throws herself into her new life. But her recovery is marred by strange side effects: Nightmares. Hallucinations. A recurring pain that flares every day at the exact same moment.

Then Stella meets Levi Zin, the new boy on everyone's radar at her Seattle prep school. Stella has never felt more drawn to anyone in her life, and soon she and Levi are inseparable.  Stella is convinced that Levi is her soul mate. Why else would she literally ache for him when they are apart? After all, the heart never lies...does it?