This is book number 5 in the Leo Maxwell Mystery series.
In Wolf's Revenge, the fifth novel in Lachlan Smith's critically acclaimed series, attorney-detective Leo Maxwell seeks an exit strategy from his family's deepening entanglement with a ruthless prison-based gang. Caught between the sadistic criminal Bo Wilder and the FBI, Leo charts his own path in defending a young woman who was manipulated into murdering an Aryan Brotherhood member in broad daylight. When the consequences of the case strike heartbreakingly close to home, long-held secrets are revealed, transforming Leo's perspective on the aftermath of the tragedy that derailed his childhood and fractured his family over two decades ago. Leo comes to realize that there's no such thing as fair play in the battle against a prison gang that's already being punished to the full extent of the law. The question then becomes who will get revenge first--the Maxwells or the gang leader who pursues them?