The Lost Key: A Mystery with Whole NumbersMelinda Thielbar
Books in order
- The Hundred-Dollar Robber: A Mystery with MoneyMelinda Thielbar
- The Secret Ghost: A Mystery with Distance and MeasurementMelinda Thielbar
- The Kung Fu Puzzle: A Mystery with Time and TemperatureMelinda Thielbar3
- The Ancient Formula: A Mystery with FractionsMelinda Thielbar
- The Fishy Fountain: A Mystery with Multiplication and DivisionMelinda Thielbar
- The Book Bandit: A Mystery with GeometryMelinda Thielbar
- The Runaway Puppy: A Mystery with ProbabilityLydia Barriman
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