After discovering the source of the unusual attacks on the base, Sean and his team go after him.

13 -- Diamond Wing

In this podiobook: Checkwolf is a crimefighting organization, a group of talented vigilantes who have come together to battle corruption in their own way. Led by the enigmatic Sean Matts, this group of a dozen skilled men venture out into a small-scale area in the fictional metropolis named Kewanee, righting wrongs that the police are unable to touch.  Initially, they operate from a small garage owned by one of the Checkwolf members, the epitome of a minor operation.  But Sean Matts has a greater vision for his group, one that will take them from their humble beginnings and turn them into a force to be feared.The Checkwolf series is a collection of stories chronicling the activities of Checkwolf's third phase, from its mainstream recognition to its full integration.  Book 1 is a group of general stories: getting to know Checkwolf and their methods as they gain mainstream recognition, watching them learn and adapt to new situations.