Sneak peek of 'Injustice with Nancy Grace' season finale: 'Too many red flags' (Exclusive)

The season finale of Oxygen's "Injustice with Nancy Grace" is a doozy.

Nancy Grace will unpack the suspicious death of Shele Covlin in the riveting episode, which involves the tug of war between religious law and criminal law in order to seek justice for Shele.

In an exclusive sneak peek of the finale available only on AOL, Grace begins to question the victim's family's claim that her death was an accident.

"You know what's tricky in a case like this? It reminds me in an arson case, in a way: In arson, you have to prove a crime even happened before you can start saying, 'Wow, who did it?'" she explains in the clip. "This was an accident, according to everyone; she slipped and fell in the bathtub. Me? I don't buy it. There's too many red flags, too many problems, too many things that don't fit."

The finale of "Injustice with Nancy Grace" season one airs on August 31 at 6 p.m. only on Oxygen