Anne is busy preparing for Christmas when she finds a delicate key among Aunt Edie's holiday decorations. Anne soon discovers that the key unlocks a cubby in the church's Advent cabinet, which contains a beautiful sapphire ring. Did it belong to her recently deceased great-aunt? If so, why was it locked away and not among Aunt Edie's jewelry? And why is Reverend Tom tight-lipped when Anne asks him about it? Her search for the truth uncovers new revelations about her beloved great-aunt and a trail of secrecy and intrigue that stretches from cozy Blue Hill to Philadelphia. Meanwhile, Anne is delighted when Ben and Liddie agree to participate in the church's annual Christmas play, but the production is in jeopardy when costumes go missing and the director becomes ill. Can they overcome the obstacles to ensure that the show goes on?