Jones laughed. The enjoyment of one's own ideas--or of the absence of them--is a literary trait. When Dumas wrote, he roared. Here it is, then, Jones continued. If the police knew certain things they would nab Lennox. If they knew others, they would nab Cassy Cara. If they knew more, they would nab me. I should be held as a witness. This is cheerful, particularly as my sole complicity in the matter has been due to a desire to be of use. But that is just it. Through the enigmatic laws of life, any kindness is repaid in pain. Pleasurably, for a moment, he considered the altruism of that aphorism. Then he got back at the murder which, he decided, must have been premeditated by some one who knew where Paliser would be. That conclusion reached, he groped for another. Lennox knew, but did Cassy know, and, if she did, had she utilised the knowledge? To decide the point he reviewed the visit of the previous evening. Ostensibly Cassy's visit had been occasioned not by any wish to relate what had happened to her, but to acquaint Lennox with the cause of what had happened to him. In view of what had befallen her, the proceeding was certainly considerate. In the misadventures of life, the individual is usually so obsessed by his own troubles that they blind him to those of another. But ostensibly Cassy had sunk her troubles and had pulled them up, not to exhibit them, but to show Lennox the lay of the land as it affected not her at all but him. The proceeding was certainly considerate--unless it were astute, unless her object had been to employ Lennox for the wreaking of her own revenge. That was possible, but was it probable? An ordinary young woman would have gone at it differently, gone at it hammer and tongs. Cassy's methods were merely finer. That was the common sense view. But was it psychology? The common sense view that is applicable to the average individual is inapplicable to a problematic nature and, consequently, not to Cassy, who must therefore have had another incentive for her visit, an incentive stronger than the primitive instinct for revenge. But, Jones asked himself, what are the fundamental principles of human activity? They are self-preservation and the perpetuation of the species. Every idea that has existed, or does exist, in the mind of man is the result of the permutations and combinations of those two principles, of which the second is the stronger and its basis is sex. That is what actuated Cassy. She is, or was, in love with Lennox, and told him for no other reason. That is it, Jones decided. But the course of her true love could not have run very smooth and, knowing that Lennox was otherwise interested, she took up with Paliser out of pique. Pique! he repeated. But no, that is not Cassy Cara either. She----