Voices screaming in her head...dark angels pursuing her...desperation driving he to climb to the top of a Chicago building. When Cassidy and her reporter husband Zach rent their Marina City condo to Delia, she has been stabilized on medication for several years. Then, a few months later, she goes off her meds and has a psychotic break. "You have to come here," Delia whispers to Cassidy. "I can't tell you over the phone...people are listening. After Cassidy arrives at Delia's condo, the schizophrenic woman describes the incident she witnessed in the rooftop room the previous night. "I opened the door a crack. I saw the Angel of Death, all shiny and glistening. He was standing in front of a closet where a naked body was hanging." That same day a man is discovered missing from the building. As Cass probes deeper into the mystery, she has reason to fear that she will disappear as well.