"Memoirs of a Physician" begins where "Joseph Balsamo" leaves off. Parisians panic after a fireworks display goes awry. Andrée is almost crushed to death by the manic mob. Andrée's brother Phillip desperately searches for her and is feared dead - until she is returned unharmed to her family by the mysterious Balsamo.

Lower born Gilbert is still madly in love with Andrée and he follows her (working as a gardener) when she is taken into service by Marie Antoinette. Madame DuBarry continues her schemes, as does the mysterious Balsamo working with the Freemasons to stir unrest against the monarchy and lustful Louis XV takes one look at the beauteous Andrée and he plots with her father to make her his latest conquest