Clark's Law (Babylon 5, Book 4)

Space Station Babylon 5 is a popular port-of-call and home to many aliens from throughout the universe. Keeping law and order in this last bastion of peace is only one of the perilous responsibilities of Commander John Sheridan, Lt. Commander Susan Ivanova, and Security Chief Michael Garibaldi. Serving the residents of space port of call Babylon 5, Captain Sheridan is torn between duty and defiance when he is ordered to execute an alien for a crime he did not commit