The Lyon's Den (2003)

Jack Turner, plucked from his free law clinc and brought to the white shoe law firm of Lyons & Lacrosse after the mysterious death of his mentor, Dan Barrington, who ran the place. Owing it to his memory, Jack leaves the world of "street law" and involves himself in high stakes cases as he becomes increasingly convinced his mentor was murdered. Possibly because of something or someone at the firm.