Cold Fire by Dean Koontzby Dean Koontz

Teacher Jim Ironheart, aptly named, is sent by forces unknown to save chosen people in life-threatening situations. By chance, a young but jaded reporter stumbles onto his missions, and joins him to investigate who is controlling him and why. Shared nightmares begin to point to an extraterrestrial influence, and the pair are forced to confront Ironheart's forgotten past for answers. 

Reuploaded Thanks to stoker