Phantoms In Philadelphia (Phantom Knights Book 1‪)‬

When you live a life of secrets, you trust no one and question everything
Nineteen-year-old Bess Martin has many secrets. She can outride, outshoot, and outsmart most people, but her greatest secret...she is the leader of the Phantoms, a spy organization.

After spending three years fighting in a war, eighteen-year-old Jack Martin returns home to Philadelphia with his sister Bess, ready to live a life of ease, but what is waiting for them is a task more difficult than any other battle they have fought.

When people start disappearing and the weather turns unusually cold, the city is in a panic. They believe the war angered a deity and that the disappearances are the sacrifices, but who will be next? When presidential hopeful James Monroe is targeted, all clues lead to the mysterious secret society known as Levitas. It is up to Bess, Jack, and their team of Phantoms to uncover a dark and winding plot that reaches further than they could have ever imagined. As their journey draws them deep into secrets of the past, Bess and Jack may come to find that a normal life is not possible when you are a spy.