No time was lost in instituting a search for the authors of the plot. The lieutenant of police selected the most skilful and intelligent of his officers, the detective Saint-Marc, who put himself in communication with Danry. But he had not spent two days with the assistant surgeon before he drew up a report demanding his arrest. "It is not unimportant to note that Danry is a surgeon, and his best friend an apothecary. In my opinion it is essential to apprehend both Danry and Binguet without further delay, and without letting either know of the other's arrest, and at the same time to search their rooms." Accordingly Danry was conveyed to the Bastille on May 1, 1749, and Binguet was secured the same day. Saint-Marc had taken the precaution to ask the assistant surgeon for a written account of his adventure. This document he put into the hands of an expert, who compared the handwriting with the address on the packet sent to Versailles. Danry was lost. Suspicion was but too well confirmed by the results of a search in his room. Being shut up in the Bastille, Danry knew nothing of all these proceedings, and when, on May 2, the lieutenant-general of police came to question him, he replied only with lies. Berryer, the lieutenant of police, was a man of much firmness, but honourable and kindly disposed. "He inspired one's confidence," wrote Danry himself, "by his urbanity and kindness." This excellent man was vexed at the attitude taken up by the prisoner, and pointing out the danger he was incurring, he besought him to tell the truth. But at a second examination Danry only persisted in his lies. Then all at once he changed his tactics and refused to answer the questions put to him. "Danry, here we do justice to every one," said Berryer to him, to give him courage. But entreaties had no better success than threats. Danry maintained his obstinate silence; and D'Argenson wrote to Berryer: "The thorough elucidation of this affair is too important for you not to follow up any clue which may point towards a solution." By his falsehoods, and then by his silence, Danry had succeeded in giving the appearance of a mysterious plot to what was really an insignificant piece of knavery.