Captured by the Earl (The Secret Crusaders #2)
Melanie Rose Clarke

The earl returns.
Philip is shocked to arrive home to an unexpected betrothal. He doesn’t know Lady Emma’s motives or goals, yet the intelligent lady intrigues him. He will continue the ruse, chasing her secrets, even as he continues his own clandestine work. He saves people while in disguise, setting London aflame.
As everyone guesses the identity of the mysterious masked rescuer, Emma and Philip delve closer and closer to the truth, and each other.
When secrets are revealed, will a pretend betrothal become real?