Nick's grandfather is celebrated as a hero for helping miners escape out of a collapsed mine. Nick, Jess, and Sofia decide to go into the mine many years later to document the mines and end up with an accurate account of Nick's grandfather's final moments. As they enter into the mines, strange things begin happening and they start finding even stranger journal entries written by Nick's grandfather.

This story reminded me a bit of As Above So Below and The Descent. This story was fast-paced and pretty action-packed. My only complaint is that I felt as though the book ended abruptly. It was also a little bit predictable, but still very enjoyable.