SIGNED, SEALED, DELIVERED introduces a quartet of postal workers in the Dead Letter Office who transform themselves into an untraditional team of detectives to track down intended recipients of undeliverable mail. Their missions take them out of the office into an unpredictable world where redirected letters and packages can save lives, solve crimes, reunite old loves and change futures by arriving late but somehow on time. The intrepid team led by the handsome and charming Oliver (Eric Mabius) who considers the stamped and mailed letter to be the gold standard of communication.