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Despite worrying results, demand for tuberculin overwhelms the Charité. Behring's diphtheria cure is put to the test. Ida meets Tischendorf's father.
Nurse Therese falls ill. Koch tests tuberculin on humans, starting with himself. Behring reaches a breakthrough in his work on a diphtheria cure.
Koch fails in one aspect of his life, but succeeds in another. Ehrlich faces a betrayal and increasing anti-Semitism. Ida rethinks her future plans.
At Berlin's Charité hospital in 1888, Ida finds romance, a path to her dream job and an inside look into cures for tuberculosis and diphtheria.