When the team discover an undelivered love letter, their initial investigation unravels more questions than answers. As their new Supervisor implements stricter policies and procedures, the team's challenges are multiplied. In the letter, ranch owner Sam has written his childhood sweetheart with a passionate plea. But the Postables recognize a domino effect this long lost letter will have on its recipient and the people in her life. Unsure of how to proceed, the team regroups and comes to learn that there is a right time for everything in life... even love.