"You believe Mrs. Lawrence was the woman in the taxicab?" "I've got to believe it." "Do you believe she killed him?" "Evidence points to that answer, Leverage. You see, Barker's story impressed me this way: it is the only sane, logical solution of the killing which has yet been advanced. Neither of us has ever yet hit upon an answer to the puzzle of the body in the taxicab. What Barker tells us is perfectly plausible--" Carroll paused-- "You see," he continued, "from the first I have maintained that Mrs. Lawrence is a decent woman--innately decent. I will even admit that her domestic life was so miserably unbearable that she would entertain the idea of eloping with Warren: that she went so far as to attempt to carry that idea into execution. But I am also ready--and eager, too, if you will, to believe that when she reached the stepping off place she must have reneged. That woman couldn't have done anything else. "We are fairly well satisfied--from Barker's own story--that there had been nothing wrong in the relations between Warren and Mrs. Lawrence up to that night. But we are pretty sure that they met at the station to go away together. What is more reasonable than to presume that she lost her nerve at the eleventh hour: that, unhappy as she was at home, she was unable to take the step which would forever make her a social outcast? "Very well. If that is true, we have them at the station at midnight. The weather is the worst of the year. They are standing in the dark passageway between the main waiting room and the baggage room. No light is on the corner of Jackson street. They see only one taxicab on duty. For all they know--the last street car has passed. They conceive the idea of making a single taxicab do double duty--and, knowing that the driver is across the street drinking coffee and getting warm--Warren gets into the cab from the blind side, Mrs. Lawrence returns to the waiting room as the accommodation rolls in, she picks up Warren's suit-case which had been left there, steps to the curb and summons the cab, in which Warren is hiding all the time. Sounds all right so far?" "Perfectly," said Leverage. "Go ahead." "Walters gets the signal and drives up. Mrs. Lawrence gets in. He drives away. And then--" Leverage leaped forward eagerly: "Yes--?? and then?" "Well," said Carroll slowly, "we don't know what happened in that taxicab. We believe that Mrs. Lawrence is a decent woman. We know that Warren would have gone through with the elopement. That being the case, we can fancy his keen disappointment. Under those circumstances, Eric--a good many things could have occurred in that taxicab which might have justified Warren's death at her hands."