The story centers around Paul's letter to the Roman church led by Prisclla and Aquila. He entrusts 2 scrolls to her, one with almost step by step instructions on how to find them. The other is the letter, which Paul has read and reread as a scribe took his dictation. Phoebe has memorized his inflection and emphasis with some coaching from Paul.
Phoebe is a deacon in the church in Cenchrea, not far from Corinth. She was left a wealthy widow when her husband died, from the description of his symptoms, I would say he had tuberculosis (I am a retired RN). Though she would rather have Albus than the wealth, she has put the money to good use, helping the poor, widows and orphans, and leading them to Jesus.
Paul says she is the only one who can deliver the letter, and so she goes, along with Trecia, whom she rescued from the streets, and who serves her out of a loving obligation, and Joses - to whom Paul has instructed to protect the women and their precious scrolls, and who has had Joses memorize the way to Priscilla's and Aquila's household.
And so Phoebe's, Trecia's, and Joses's adventure begins, with all effort expended to keep the messenger and the message safe. Dangers test their faith, and weariness is their companion on the journey as they make every effort to complete their mission.