Disguised Power: Undercover Dad in Action

Nathan Larson is working as a security guard under a false name. Six years ago he was lord of Dracohall, called Lord Warwyn, and then he disappeared, after the massacre at the Heaven's Gate that killed 100,000 of his soldiers. The disguise lets him investigate that massacre quietly. He is also looking for the woman who saved his life at the time. Outside his company he rescues a girl, and she turns out to be that woman's child and his own daughter. He becomes a father, and between that and the secrets he is chasing he starts turning up what was buried about the conspiracy that destroyed his old empire.