A mysterious signal. A newfound friend. Life-or-death risks in which everything Libby, Caleb, Jordan, and Peter have worked for can be lost in The Mysterious Signal, the fifth Freedom Seekers novel. Then a dangerous enemy threatens not only Jordan, but also his father and Peter. Will the great detective Allan Pinkerton offer the surprising solution they need?

But then her Aunt Vi sets off new obstacles in Libby's self-worth. Can she go beyond her hurt to bring help to others?

As a life-threatening steamboat accident changes every plan, how can the Freedom Seekers work together to escape? And will they be able to save the Christina before Pa loses it forever?