Alan Moore's The Courtyard (Alan Moore's The Courtyard #2)

FBI man Aldo Sax's legendary skills at piecing together the most baffling of cases has gotten him assigned to what may be his most confusing case yet. He has almost zero leads to go on, but the one hunch he does have takes him from a concert by the Ulther Cats to the mysterious courtyard in front of the home of a purported drug dealer. What follows is a whirlwind of sudden activity and unexpected twists that leads to a surprise ending that will shock you.