Adventures of a Time Traveler - Time Amazon, #5

Change your past, and you destroy your future. It's been four years since Ariyl Moro left, and David Preston has moved on with his life - until an unexpected delivery plunges him into the mystery of vanished Time Travel Agent Dylila Duprae, an infamous Old West battle, Stephen Hawking, plagues of microbes and runaway nanobots, a president missing from Mount Rushmore, a Roman Empire that lasted another thousand years, and a paradox which threatens to erase all history. Sci-fi meets romantic comedy with sword-swinging adventure!