"You see," explained Cahill, "we know crooks’ ways pretty well. When anything gets pulled off we can tell from the method used just about where to look for our men. We have felt pretty sure all the time that this was some Black Hand bunch from the Dago settlement on the West Side. It’s the same line of approach. The only difference is that they’re operating a little higher up than usual, and choking the guys off quietly with some kind of gas, instead of filling them full of lead from a sawed-off shotgun. The idea’s the same, only they’re getting a little more ambitious—that’s all." "And about the car," prompted Forrester, still amused at the trend of the detectives’ theories. "That’s just the point," continued Cahill. "Today we located a car with half a dozen bullet holes in the back in a garage out on Grand Avenue. Grand Avenue, you know, is full of Dagos all the way from the river. The garage man said it was left there late Tuesday night by three young Italians. Now, do you get the idea?" Forrester did, and he was astounded at the news. "You mean," he queried, "that you ascribe this whole affair to some West Side Black Hand band, and that this car proves your theory?" "Sure thing!" assented Cahill. "O’Connor and me have been working on this case for months. Sometimes we thought we had a clue, and then again we didn’t. We have suspected Black Handers from the first, but we couldn’t exactly get a line on them. That tip you gave us Tuesday night started things right. Now we know where we’re at. There’s three detectives in overalls in that garage right now, and if those guys come back for their car the whole thing’ll be cleared up in a jiffy." "What makes you think that this is the car you wanted?" persisted Forrester, still doubting the correctness of the detectives’ theories. "Headquarters has no report of any other car being shot at by the police. And this car was left late _Tuesday_ night. Get the idea?"