Metal Bones - Metal Bones, #1

Leo Spearman cares about one thing: getting a cure for Gaeth's "Steel Elbow".  Yet, when they decide to leave Earth to cure him, they realize they may have to break galactic law to get it. Leo believes everything is going according to plan but when their new ally Sonja comes along, Leo becomes more and more dedicated to the resistance, a group set on stopping the Sol Empire from taking over the galaxy.
As Leo and Sonja's connection starts to grow, Gaeth begins questioning his brothers' dedication to finding his cure.  Across the galaxy, an alien named Tank is determined to win The Ceremony, hoping to find out what happened to his father, who won before him. Only when he finds his answer, he is forced to escape his home, losing his hand in the process. After being saved by Enzu, she equips him with an arm cannon, the only expense being to work for her and protect a small boy named Myca at all costs.
Tank is grateful of Enzu for saving him, but the more time he spends at Bisekt, it makes him question everything and who to trust.  However when an outside threat forces Leo and Tank to work together, they'll discover if they'll be able to save the ones they love or if it's already too late.