Race Back in Time - The Key of Earth 1 - (Alex's Race Back in Time, #1)

Steve has always had Alex's back. But this time, it's the other way around.
Things go south when Minecraft heroes Alex and Steve are unable to save the world from Herobrine Prime's doomsday device. Their enemy is out for blood and defeats them. When in the final moments of battle her best friend dies protecting her, Alex is presented with a chance to save the world and him: to go back in time and change fate itself.
With a Time Locket lent to her by The Oracle of Time and a map to all three keys that operate Prime's Device, Alex must venture back into the past, find Steve, retrieve each key from its secret location, and set things right. New friendships and adventures await our heroine as she fights her way through.
But the question still remains: can Alex stand all on her own?