Karen Turney (Lori Heuring)'s husband had been suffering from illness for a long time and eventually died. Karen, who lost her source of income, had to move to the Caton Mine in Eddy Town, Pennsylvania with her two daughters: Sarah (Scout Taylor-Compton) and Emma (Chloe Moretz), and lived in a house under her husband's name. She wanted to escape the sad past and live a dull life, but the bad luck was lingering. In 1913, a serious gas explosion occurred in the Caton Mine, and many young child workers were buried alive there. Since then, the evil spirits of the children have been lingering nearby, retaliating against humans. Soon, Emma disappeared mysteriously. Karen didn't want to lose her daughter again, so she and Sarah embarked on a dangerous journey to find Emma...