Diabolical(2011)

Hank SchwaebleJonathan Maberry

Someone is trying to open a portal to Hell, and some others will do anything to stop it
 
Or so they say.
 
Jake Hatcher, lying low in Southern California, isn't all that surprised when he's asked to jump back into the battle between salvation and damnation and stop those bent on raising the forces of darkness--it's just why and by whom that's unnerving. Especially when it's put to him as an offer he can't refuse.
 
A former nun named Vivian Fall believes that a Hellion has escaped the infernal regions and returned to earth on an unholy mission--to unleash the forces of damnation on an unsuspecting world. Only Hatcher has the experience to track such a being. Only Hatcher has dealt with those who likely to know what what's really going on. And only Hatcher can get close enough to it--because the Hellion happens to be his own brother.