Diary of a teenage immortal

Alexandria was just an average teenager, until a few months before her first day of high school. She refuses to accept the death of her father, the only one who could possibly know what is happening to her, and begins to rely on self-harm. Until she meets Alexander. A smart, cute, rich and goth kid she instantly falls for. But Alexander has a little secret of his own. Will they both work together to find her dad before the sand in the hourglass runs out?