Technikron

A massacre. A murder. A stolen machine that could destroy a city. Mercenary Deckard Kimble comes home to Technikron with blood on his hands and ghosts at his back. When his former mentor is murdered and a deadly prototype disappears, Deckard is forced into an uneasy alliance with the two people he left behind long ago: Eris O'Connell and Gretchen Walker. Framed for the crime and hunted across the city's dirt roads, train tracks, and skies, the estranged trio must outrun corporate enforcers, ruthless gangs, and the unseen enemy pulling the strings-before a ticking superweapon turns Technikron into a graveyard.
A standalone steampunk action thriller with sequel potential.