Du Bosse is one of the men hired by the Marquis to help murder Adeline when she was originally taken from the convent. He spots La Motte while La Motte is jailed in Paris. When Du Bosse learns what the Marquis has accused La Motte of, Du Bosse provides incriminating evidence about the Marquis that helps to free Theodore and has the Marquis put on trial for the murder of his own brother.