Black Magic Money

It looks like easy money to grad student Matt Diaz: go to an old house and grab a red leather book.  
 
How hard could that be?  
 
Payment: a thousand cash, wired into your account, with a few hundred dollars in good faith money to start.  
 
Once he enters the house, he discovers that getting in is going to be a lot easier than getting out, and he's going to have to find a way around a curse, a hitman, and a greedy killer to do it.  
 
A 5700-word supernatural suspense short story.