Books like Fighting Fit

After a hush-hush trip to Ancient Rome, Orlando is clearly disturbed by what he's seen, so when he decides to go back, with a team of volunteers, Mel loyally signs up. It looks as if this will be the mission of her dreams, but in the cruel, decadent world of Nero's Roman Empire, her fantasies crumble. Who is the mysterious girl gladiator Orlando seems to be trying so hard to protect? How did he come to meet her? Is his concern purely professional, or is it something more?