Leverage shrugged: "That's where you come in, Carroll. I ain't the sort of thinker who can puzzle out something like that. Of course I'd say the only place the shift could have been made was when the taxi stopped at the R. L. & T. railroad crossing--and every time I think that it strikes me I must be wrong. Because any birds working a case like that couldn't have counted on such a break in luck." "It might have been," suggested Carroll, "that two men entered the cab at that crossing: Warren and another--both alive, and the killing might have occurred between then and the time the cab reached number 981 East End Avenue." "Might have--yes. But something tells me it didn't. It's asking too much--" "Then what _do_ you think happened?" "I don't think. There just simply isn't anything you can think about an affair like that. You either know everything or you don't know a thing!" "I think you're about right, Leverage. And now--let's run over the list we have in front of us. Spike Walters--the taxi driver--comes first. What about him?" Leverage rubbed his chin. "Funny about Spike, Carroll--I think the kid's story is true." "So do I." "But unless there's some other answer to this affair--it's damned hard to believe that the body could have been dumped into that cab, or that the killing could have occurred there, without Spike knowing about it. Ain't that a fact?" "It is." "And if he knows anything he hasn't told, the odds are on him to know a whale of a sight more. And if he knows a whole heap--then the chances are he knows enough to justify us in keeping him in jail." "You're right, Leverage. If Spike is innocent he's not undergoing any enormous hardship. But if his story is untrue in any particular--then it is probably entirely false. And since we cannot understand how that body got into the cab or where the murderer went--we've got to hold on to Spike. Meanwhile, we both believe him." "You said it, David. Now, next on the list we have Barker. What about him?" "I don't like Barker particularly," said Carroll frankly. "He hasn't what you would call an engaging personality. Not only that, but we are agreed that he knows a great deal about the case which he hasn't told--and doesn't intend to tell unless we force him to it. But we'll go back to him later: he's too important a link in the chain to pass over casually when we're trying to hit on a definite course of action. Remembering, of course, that his visits to the Lawrence home have a certain degree of significance." Leverage chuckled grimly. "You're coming around to my way of thinking, David Carroll. Remember, I wanted to stick that bird behind the bars the first day we talked to him--when we first knew he was lying to us." "Yes--but we wouldn't have gained anything--then. Perhaps now the time is ripe to try some of that third degree stuff. But let's take up the others. My little friend, Miss Evelyn Rogers, for instance."