Bridgevine

Mike Price's world is shattered when his sister is gunned down in a school shooting. As a fourteen-year-old, he vows to find a way to avenge her death.
Thirteen years later, Mike has found a way not only to avenge her death, but to erase it. He's never wavered from his promise to his slain sister, but in the process, he's become blind to what's going before him. He doesn't realize what he's been doing has caused severe ramifications, and in the balance hangs the fate of Mike, his sister, and the machine itself.