Estranged from the best friend whose brother killed her sister in a school shooting, a grieving Cora receives a message on her twelfth birthday from her friend, asking for her help with creating a time portal to prevent the tragedy.

Ever since the mass shooting at her California high school, junior Morgan Grant has become increasingly agoraphobic until even the idea of stepping outside her door can bring on a panic attack, a situation not made any easier by the fact that her parents are divorced--but when Evan moves in next door she finds herself attracted to him and begins to find herself longing for the life she has been missing.

On April 20, 1999, Eric Harris and Dylan Klebold walked into Columbine High School in Littleton, Colorado. In a matter of minutes, they killed twelve students and a teacher and wounded twenty-four others before taking their own lives. For the last sixteen years, Sue Klebold, Dylan's mother, has lived with the indescribable grief and shame of that day. How could her child, the promising young man she had loved and raised, be responsible for such horror?...