The Hymn/Night Plague by Graham Masterton
THE HYMN - In the Californian desert a bus load of people have burned in what the police think is a gruesome suicide pact. Lloyd Denman thinks otherwise for he has already begun an investigation following the horrific death of his fiancee that will take him back into the past, back to someone who helped create the horrors of Nazi Germany and who is now redefining the meaning of terror. NIGHT PLAGUE - For generations the Nigh Warriors have used their awesome powers to defend humanity from evil, entering dreams to change the shape of waking reality. Now five modern Night Warriors face their most terrifying enemy. She is Isobel Gowdie, witch and mistress of Satan. Her evil influence seeps through the earth, carrying the seeds of the Night Plague, a disease which twists men's souls into madness..