Love's Proof by Catherine Palmer

When high-spirited Jane Fellowes finds her world turned upside down, she is determined to right it. First her uncle experiences periods of violent insanity, then her father is accused of crimes he surely cannot have committed. When Jane finds Sir Isaac Newton's box of mysterious scientific discoveries in her mad uncle's home, she feels compelled to analyze the information within. Can it be true that the box contains proof of the existence of God?