Linear Shift — Paul B. Kohler

No one said time travel would be easy. Peter Cooper, a widowed father of two whose life is crumbling around him -- until a bizarre encounter with a desperate Army general launches him on a risky mission: to go back to 1942 and change a moment in time. The repercussions will almost certainly alter the conclusion of World War II. But will the ripple effects stop there? And what kind of life will Peter return to? Unknown Consequences: A successful mission may not have the success he had intended.