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4-6Treasure Chest series.
Twins Maisie and Felix discover a hidden room filled with historical artifacts. Touching a letter addressed to American Red Cross founder Clara Barton transports them to 1836, where they meet the fourteen-year-old future "Angel of the Battlefield." Inconsistent time-travel logic and scant information on the real-life Barton make the twins' journey feel purposeless. An appended biographical note fills in some details.