‘Sit, mademoiselle!’ Jacquemin bellowed. His right hand went dramatically to his pistol holster and hovered there just long enough to make Jane Makepeace swallow, glare and decide to take the seat offered.

‘Joe, this goes too far,’ she advised him. ‘Enough’s enough! You must call this attack hound to heel. Who does he think he is? Who does he take me for?’

‘Miss Makepeace, we both take you for a killer. The killer of Estelle Smeeth. We’re waiting to hear your confession.’

‘I will say not a word further until I have my father’s lawyer at my side, to offer counsel,’ she announced.

‘Well, you’d better tell him to attend you in the women’s prison in Avignon,’ said Joe. ‘In about a month’s time. They do things differently in France.’ He had no idea what the rules were himself and was reasonably sure that Jane Makepeace knew even less than he did of the French legal system. Jacquemin backed him up with a sententious nod.

‘The first thing the examining magistrate, after reading your confession (which we will note down), will want to know is why you killed Miss Smeeth,’ Joe said. ‘Would you care to rehearse it with us first?’

The answer came patiently: ‘I’ve told you—I didn’t. I liked her. I was her friend. Why would I kill her?’

‘On the contrary, you loathed her and were jealous of her. But these feelings in themselves were not sufficient to incite you to murder. Your motive went beyond personal dislike. Miss Smeeth’s death was a cold and clinical event, a step on your ladder to the goal you had set yourself.’

Jane appeared puzzled. ‘Goal? And what do you imagine that to have been? To get myself arrested by the Police Judiciaire? For that is the only result I can see ensuing. I could have bumped off … um … Cecily or yourself with much less fuss, had I wished to provoke a pantomime of this nature.’

‘It was a step in your progression. A death to fulfil the desire of a black and pitiless heart.’

Her lip curled. ‘I never read penny dreadfuls and I don’t want to sit here and listen to you regurgitating one.’

‘I see I shall have to tell a convincing tale, Miss Makepeace, in blunt policeman’s language. Not to satisfy you particularly—but a French judge. Where to begin?’

Joe had already decided on his beginning. ‘With the clever, choosy and disillusioned woman who met last year an interesting guest at her father’s dinner table. A French aristocrat. Lord Silmont. September, was it, Jacquemin, when the lord paid his visit to Harley Street? The stamps on his passport bear witness as do the labels on the medicine bottles in his cabinet. Do feel free, Miss Makepeace, to step in and correct me at any point. The talented daughter finds she has much to talk about with her father’s elderly art-loving patient. He is impressed with her. He is a man who, by his own admission, enjoys collecting people as well as objects. He invites her back to work on his collection of antique possessions. Eager to escape the dim bowels of the British Museum with its masculine environment, its scramble for promotion, its petty jealousies, and spread her wings, she accepts.

‘She’s good at her job. She settles in and finds her surroundings congenial. More than congenial—she falls in love with the château and all it contains. The lord, aware that she understands his physical condition, trusts her doubly. But it is not the lord who intrigues her. It is his younger cousin. She becomes deeply attached to the future owner of the household she has already fallen for.

‘She grows ever closer to Guy de Pacy, content to take her time and make herself indispensable to him. And she monitors the lord’s advancing sickness. But then her idyll is disturbed by the annual irruption into the house of the summer colony of artists from whose efforts the lord derives all manner of benefit. And one of their number, a pretty young model, sets her cap at the steward. Though skilled in the art of fending off female attention—Guy has his own demons to contend with—such is the allure of this girl that he finds himself swept off his feet and in the middle of an affair with the much younger woman.

‘It has to be stopped. Our London lady—shall we call her Jane?—has a word in the ear of the lord. We must imagine the poison she drips in—“promiscuous, manipulative whore,” may well have featured. The family name is threatened once more. Guy must be made aware. Brought back to his senses.

‘Her ploy seems to be successful. A cooling-off ensues. Perhaps certain threats regarding testamentary dispositions were made? At any rate the two lovers are, from now on, left casting hard glances at each other across the table. Estelle, broken-hearted, flirts rather desperately with the other men to rekindle his interest but only makes things worse by doing so. Jane monitors the success of her tactics by becoming close to Estelle. The girl begins to trust her—Jane, after all, has some skill in drawing people out—and, with no one else to confide in, Estelle tells her new friend more than is wise.

‘Meanwhile Jane is establishing her position in this little society. How often I’ve heard it since I arrived—“Oh, you’d better ask Jane … Jane will know … That’s Jane’s preserve—tell her.” You asserted your authority,’ said Joe, turning at last to confront her directly, ‘in the dormitory in the matter of Cecily and her schoolgirl activities. And the snake it was that died. By your hand. Or your instruction. The under-forester’s evidence is yet to be heard. I dare say you had no more bad feeling for the creature than you had for Estelle. Its death was necessary and its body useful to you. It established your precedence. Dorm prefect first, school captain next, add a dash of matron. All very useful but what you really wanted was the châtelaine’s keys. You wanted Guy de Pacy and you wanted Silmont.

‘And then your ambition suffered a kick in the teeth. Estelle discovered that she was pregnant. She seems to have been quite clear that de Pacy was the father. Who knows? She went to tell him. What can have been his reaction? You could probably tell us, Jane, because I suspect he unwittingly asked your advice. You probably heard Estelle’s version of events after lights out? Whatever you said—it doesn’t appear to have damped down the incandescent reaction. I was here that evening Estelle had her rendezvous with Guy. I believe she was genuinely in love. I’m guessing that he was fond of her. I’m further guessing that, in the flood of feeling that came with the notion that he was to be a father, he was telling the truth when he said he proposed marriage to her that night and she accepted him.’

Jane’s face had grown pale and her mouth was set in a tight line as he pressed on.

‘One or other of them confided in you the next morning. And you sprang into action. You decided to kill two birds with one stone. If you removed Estelle, there yet remained the obstacle of the lord. You were alarmed to note his stretches of normality between the fits of madness and pain. Wills may be altered at such times. And you knew from your father’s experience that patients can linger for inconveniently long periods. You were aware of Guy’s hatred for his cousin and his impatience to take the reins. The lord’s own behaviour presented you with an irresistible opportunity.

‘In a fit of moon-fuelled rage last Friday evening he had cleared the table tomb of its stone cargo. Anyone making serious enquiries would come rapidly to the conclusion that he was guilty of the vandalism and if the conclusion was not being arrived at rapidly enough, there you were, ready to whisper gravely of psychological disturbance and fearful disease. Ready to deliver up his cloak with a cigar end conveniently in the pocket to intrigue any bumbling bobbies. If, subsequently, a flesh-and-blood offering appeared in the same spot, the inference would be clear. The maniac had struck again. And that, I’m sure, is what you were expecting. Both crimes would be laid at the door of the mad lord. He would be arrested, executed or locked up in an asylum for the insane for the rest of his days. Two lives for the price of taking one.