A Duel in Time: Thief in Time, Book 5 (Unabridged‪)‬

DaVinci's younger sister Klee has always played second fiddle to her twin Kahlo, but all of that changes when Klee decides to secretly travel back in time to save Alexander Hamilton's son Philip from dying in a duel.

Unfortunately Klee didn't read the user's manual, and soon she's risking the lives of everyone she cares about in the 21st century for the sake of Alex and Eliza's rakishly handsome (and frustratingly stubborn) son Philip.