The Marquess of Trembley uses his gift for solving codes and puzzles to serve his country. He’s used to people asking for assistance, but when he asks Abigail Latham’s father for permission to walk out with her and the man thrusts a puzzle into his hands, he is taken aback. What on earth does the man want? Some puzzle boxes can be solved in a few moves. Some take dozens. This one takes many more than he expects, but he finds Abigail Latham herself an even bigger puzzle, one he’s delighted to study—very carefully.