Keely: a steampunk story

Crashing into the streets of London, she fell to an Earth under siege by a mysterious race known as the Otherworlders. But as foreign as the aliens are, so is she to those who find her.
Thomas Laybourne, a tinker and weapons designer finds the unconscious star girl and takes her back to his flat. Aided by his friend, Doctor Hunter and a grumpy clothier name Mattie, he begins trying to determine who she is and why she has chosen the darkest days in human history to arrive.
With most of the world under alien control, only Britain remains as the only vestige of human resistance, but the end is approaching unless Laybourne’s latest weapon can stop them. As he finishes up the weapon, his attention is drawn more and more the beauty and amazing powers of the star girl. Can they stop their advance and save the Empire in time? Or is humanity destined to end beneath the dark clouds of the aliens?