New York police sergeant John Kennedy, who had guarded Abraham Lincoln on the campaign trail, has infiltrated a cabal and discovered that an assassination attempt has been planned as Lincoln, the
president-elect, travels by train to Washington, D.C. Kennedy's boss Simon G. Stroud dismisses the threat, as does Caleb Jeffers, a militia colonel with whom Stroud is meeting. Kennedy resigns and resolves to foil the conspirators on his own. Having already sent a copy of his report to the
Secretary of War, he sends a
telegram to Lincoln, urgently requesting a meeting in Baltimore. On February 22, 1861, Kennedy boards the train bound for Washington, where Inspector Reilly is to give him his train ticket. However, Kennedy cannot find Reilly and is forced to disembark. As the train departs, Kennedy sprints after it and sneaks aboard. Among the other passengers are anti-slavery writer Charlotte Alsop and Lance Beaufort, a West Point cadet who plans to resign and enlist in the Confederate army. Beaufort is accompanied by his sister Ginny and their slave Rachel. Kennedy discovers Reilly's body on the exterior platform of a train car, but the corpse slips from the train as he is reaching for it. When Kennedy returns to his berth, he finds an imposter claiming to be him and in possession of his ticket. A passenger named Caleb Jeffers vouches for Kennedy and gives him a spare ticket to share his compartment. The imposter forces Kennedy to leave the train at gunpoint at the next stop, planning to kill him when the train whistle sounds. Kennedy fights with him and the commotion attracts Jeffers, who shoots and kills the imposter. However, Kennedy is uncertain for whom the bullet was intended. Jeffers steals the
derringer that he had lent to Kennedy and shoots him. The bullet does not injure Kennedy, who had tampered with it. Jeffers confesses that he is involved the plot in order to protect his shares in Northern cotton mills that would be adversely affected by war. At the Philadelphia stop, Kennedy tries to have Jeffers arrested, but is arrested himself. Rachel unsuccessfully tries to deliver an urgent message to Kennedy, who escapes and reboards the train. The conductor is ordered to hold the train until a special package is delivered. A passenger named Mrs. Gibbons takes her ailing husband aboard. Kennedy encounters Rachel, who informs him that Beaufort is disembarking in Baltimore, not Atlanta as he had claimed. Kennedy is taken prisoner by Beaufort and bound in Jeffers' compartment. The plotters are disappointed to learn that Lincoln has canceled his speech in Baltimore, where Beaufort was to assassinate him. Jeffers detrains, but as the train is departing, he remembers Mrs. Gibbons and surmises that her husband is actually Lincoln in disguise. Running after the train, he alerts Beaufort. Kennedy frees himself and, in the ensuing struggle, sends Beaufort tumbling from the speeding train. Mrs. Gibbons tells Kennedy that she is an undercover
Pinkerton agent and that his report to the
War Department was read by
Allan Pinkerton, who persuaded Lincoln to cancel his speech and travel incognito as the ailing Mr. Gibbons. As the train reaches Washington, Lincoln muses, "Did ever any president come to his inauguration so like a thief in the night?" ==Cast==