. >> police now believe edwards plotted to rob her old bank to pay back her debt and then some. ough tracking edwards' credit card purchases, detectives find proof that she bought the nun masks online and the zip ties from a local hardware store. credit card statements also show she rented a silver chevrolet, the same make and model of the getaway car, a week prior to the bank robbery. the fbi obtains a search warrant for the home of the man whom they believe is the male robber. they are hoping to find some evidence linking the man to the robbery, but find none. >> we were hoping to find masks, guns, zip ties, receipts, anything like that that could be used to associate him with the robbery. unfortunately, we were not able to find anything at that time. >>> coming up -- with only circumstantial evidence connecting the suspects to the crime, detectives struggle to build an open and shut case. and they need to follow the money. >> in terms of it being an oddity, this would probably rank at the top of all the cases i've ever handled. [ phone dings ] [ nephew ] hi, heath. i can't wai