When 16 year old Hanna Zepeda commits suicide, she leaves behind her best friend CeeCee Browning. CeeCee can hardly believe that Hanna, who was practically her sister, is gone...and she never saw it coming. Little did she know, Hanna had been plotting for quite some time. She'd written out letters for her numbered one to sixteen, one for every year she had lived. Each of which holds a secret CeeCee never expected--she just needs to find the courage to read them.