On June 15, 1888, a mere ninety-nine days after ascending the throne to become king of Prussia and German emperor, Frederick III succumbed to throat cancer. Europeans were spellbound by the cruel fate nobly borne by the voiceless Fritz, who for more than two decades had been celebrated as a military hero and loved as a kindly gentleman. A number of grief-stricken individuals reportedly offered to sacrifice their own healthy larynxes to save the ailing emperor.

Frank Lorenz MUller, in the first comprehensive life of Frederick III ever written, reconstructs how the hugely popular...