A Matter of Time — Brian Harmon

When Eric finds a mysterious letter written twenty years before he was born, but describing events from his own life, his simple existence as an ordinary high school English teacher once again takes a bizarre turn into the weird. Now he must scour his home town of Creek Bend in search of more letters to unearth the story of a boy who sought to save the city in 1962 from a pair of mysterious men with terrifying powers. But Eric will have to deal with two agents of his own in the present. Can he learn the truth about 1962 and save his own Creek Bend? Or Is the city doomed to repeat its fiery history? (Book 5 in the Rushed series.)