Tragedy and guilt follow Sheila Carson around like a sick puppy, causing continual estrangement from her family and a heavy fear of getting too close to other people, especially other people of the opposite sex. She cannot bear the thought of accidentally destroying another man’s life again.
Then she meets Hank Johnson. At first, the new fifth-grade teacher gets on Sheila’s nerves, especially after a run-in between one of his students and one of her Kindergartners. But Hank’s rugged handsomeness and fun-loving personality begin to win Sheila over when, one day after school, he ends up helping her search for her favorite student, Diana, who mysteriously went missing.
Sheila’s faith in God compels her to take a personal interest in Diana's broken home life, and at the same time makes her begin to wonder if Hank might be part of God’s plan for her life.
But while Hank attends church and seems to have his own brand of faith, he is hiding his own past tragedy that has caused him to doubt God’s love for him during the past several years. So when Sheila’s heart begins to lead her in the direction of missions, Hank abruptly drops his relationship with her.
But it cannot end there. A mysterious envelope that Hank has forgotten about turns out to be an intricate and shocking connection between both their tragic paths.
Will Sheila ever receive the forgiveness she desperately needs? Will Hank ever admit his love for Sheila—and shake off the past hurt that threatens to keep them apart? The Envelope weaves together the lives of one man, one woman, and an innocent five-year-old girl to bring about a heart wrenching story of healing, forgiveness, and God’s persistent love.