In 2009, filmmaker Josh Fox learned his land was on top of the Marcellus Shale, a giant reservoir of natural gas, and that he would be paid to lease his land for natural gas extraction. Fox documented his cross-country trek to find out if the controversial process of hydraulic fracking is actually safe. What he unearthed was a shocking discovery about a practice that is understudied and inadequately regulated, and he raced to find answers about fracking before it was too late.