F OR PATRICK MAHAN, the first Sunday of June in the year of 1901 would be recalled as a day of many surprises. Some of them were trivial, some were climactic, and others were decidedly unpleasant, but all were surprises nonetheless.

First was the unexpected presence of Doctor Palmer, the aging alcoholic who ministered to the malaria patients. He was actually present in the hospital on a Sunday morning. The good but very shaky doctor looked puzzled and disconcerted, and seemed to be worried about something behind him.

“We’re releasing you today,” he told Patrick. “You are to get packed immediately.”

Patrick was confused. Even though the doctor was nominally a colonel and he was two ranks lower at major, the directions were unusually peremptory.

Already dressed and ready for a morning walk, Patrick looked down at the smaller man. “Why the change? Don’t get me wrong; I’m more than ready to leave this charming place, but wasn’t this supposed to happen on Monday?”

Now the poor doctor looked really concerned. When he hesitated to answer, another man, this one much younger and very fit looking, entered Patrick’s room and motioned Palmer to leave. The doctor scuttled out as if relieved to be going.

“Now, just who might you be?” Mahan asked, trying to take the measure of his visitor. The man appeared to be in his late twenties and was well dressed in a conservative business suit.

“Sorry, Major. My name is Welles, and I’m with the Secret Service.” With that, he displayed his credentials. Impressed, Patrick examined them. The Secret Service was the security arm of the U.S. Treasury and was getting more and more involved in the personal safety of the president.

Patrick forced a smile and beckoned Welles to be seated. Welles declined. “I’ve been directed to inform you that President McKinley would like to see you at two in the afternoon in his office at the White House.”