Louis XIV had from the first taken a very strong personal interest in this case. It was his sincere desire that the investigation should be made as complete and luminous as possible, and he was determined to follow up and strike at all the accomplices, however high they were placed. The Secretaries of State had not awaited the declarations made by La Chaussée on May 24, 1673, before requesting the English Government to extradite the accused woman. In November and December 1672 several letters were exchanged between Colbert and his brother the Marquis de Croissy, then French ambassador at the court of Charles II. The king of England consented to the extradition, but declared that he could not allow the arrest to be made by English officers; that would have to be undertaken by France. Croissy was highly embarrassed. The embassy was not provided with tools for such jobs. Colbert insisted, and at length the ambassador was on the point of winning Charles's consent to the employment of English police, when Madame de Brinvilliers, taking fright, quitted England for the Netherlands. Meanwhile her husband, this amazing Marquis de Brinvilliers, had quietly taken up his abode, with his children and domestics, in the chateau of Offémont, belonging to the estate of his father-in-law and two brothers-in-law whom his wife had poisoned. He had taken possession of the surrounding domain, and actually it was not till two _lettres de cachet_ had been signed by Louis XIV, bearing date February 22 and March 31, 1674, ordering him to leave the chateau and never approach within three leagues of it, that he decided to allow the widow of the civil lieutenant to enter upon the enjoyment of her own property. We have very little information on the life of the marchioness between her departure from London and her arrest on March 25, 1676, at Liége in a convent where she had taken shelter. She had gone from London to the Netherlands, then into Picardy, the country conquered by King Louis, thence to Cambrai and Valenciennes, where she entered a convent, but was obliged to leave it on account of the war. From Valenciennes she fled to Antwerp, then to Liége. She had nothing to support her but an annuity of 500 livres, which fell to 250 on the death of her sister; she was sometimes 'reduced to borrowing a crown.' While at Cambrai, she appears to have sent asking her husband to join her there; his answer was, 'She would poison me like the rest.'