When The Postables discover an antique vase with a letter inside, they trace the package to three little girls who attempted to sell the vase 18 years ago in order to save their family farm. While the vase was an heirloom from many generations ago, the origin is suspicious. With the farm again facing financial hardship, The Postables must choose between doing what's legal and what's moral.

In the wake of Hurricane Katrina, New Orleans handyman and blues singer-songwriter Gabe Recolte was left homeless before he had the chance to express his love for club owner Hattie. Oliver and his team retrieve Gabe's love letter years later and face challenges in solving the mystery.