United they stand. Divided we fall. The Three Laws of Robotics have been subverted and the Robot Empire is now united under a new and terrifyingly familiar leader. Can the remnants of the human Galactic Empire stand against massed fleets of the machines? Will the settlers of generational ship Dawn find shelter? Will Arla escape from the mysterious world where ancient battles are fought eternally and dead warriors rise from the grave? Sledgehammer is the fourth book in the Robot Empire series of galaxy-sized adventures. If you like fast-paced science fiction in the classic mould of Asimov, Clarke, Bradbury and Bear, you'll love Kevin Partner's brand new space adventure. "Absolutely fantastic. I am so excited to finish the series, and curious about where it is going to go."