"What is Defarge’s motive in betraying doctor Manette, endangering his daughter and grandchild and framing Darnay? How might the relationship between Madame and Monsieur be described?"
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Answered by Aslan
Basically Defarge's motive in betraying Doctor Manette and so many others has to do with helping his wife avenge her sister's cruel and senseless death at the hands of the Evremonde brothers.