Earl (Cast in Time, #4)

An Engineer finds himself in an Alternate reality, Cornwall, in the year 715 A.D. He awakens in the body of a young Baron.
James Fletcher, now the Count of Cornwall, is facing new adversaries in the Franks. They try to assassinate him and his family, precipitating a full-out war. In the meantime, advancements were made in steam engines, cannons, ships, and electricity. Continue you on with this wild ride through the eighth century.