Spawn

At the end of her mental and emotional rope, Thea has a gift that can also be a curse: She can see when people are about to die. Spawn appears to Thea, but she's convinced he's there to harm her. Hell's opportunistic lords are quick to take advantage of humans in Thea's condition, and a smooth-talking, expensively dressed demon approaches her and reinforces her belief that Spawn is out to get her. The demon convinces Thea to give up her soul to him and then reveals, after it's too late, that Spawn was actually there to help.