Historical fact: In September 1902, less than a year after he assumed the Presidency upon the murder of William McKinley, Theodore Roosevelt was involved in a collision between the horse-drawn carriage in which he was riding and an electric streetcar, resulting in the death of a Secret Service agent assigned to him. -- From this tantalizing historical footnote, Burt Solomon has spun a (mostly) satisfying mystery, for TR is convinced this was no accident, but an attempt on his life. Ironically, he dispatches the man with perhaps the most to gain from his death, Secretary of State John Hay, to investigate. (At the time, the Secretary of State was next in line to succeed to the Presidency, after the Vice President.) Hay has had some experience in sleuthing (dating back to his time in the Lincoln White House), but he enters his task with mixed feelings. He is not initially convinced that there is anything to Roosevelt's suspicions, but, then, odd discrepancies begin to crop up. Why, for example, was the streetcar stopped for a period of some 19 minutes at the top of the hill above the collision site? Was the streetcar drive an anarchist...or merely a labor rabble-rouser? Why is the attorney appointed for the two trolley employees arrested in connection with the incident murdered in Washington, D.C., when he comes to speak with Hay and others? Who, besides Hay himself, has a motive for wanting to see President Roosevelt dead? Mark Hanna, the Ohio Senator who was a power behind McKinley's throne? J. P. Morgan, who opposes TR's initiatives against monopolies? George B. Cortelyou, the President's personal secretary (a position he also held under McKinley)? Was TR even the intended target -- or was it papermaking magnate Winthrop Crane, currently the Governor of Massachusetts? Hay begins to suspect he might be stumbling onto something nefarious when his life is threatened. Can he find answers before he himself becomes a victim? -- John Hay makes a very appealing detective, struggling with his strong attraction to Lizzie Cameron, collaborating with Nelly Bly, and shuttling back and forth between Pittsfield, MA, and D.C. The puzzle is very engaging and keeps the reader guessing. My only objection is that the ending/resolution of the book struck me as a bit rushed, and I did not believe enough ground had been previously laid for the solution offered. Then it's over. End of book. -- Still, I am eager to investigate Solomon's previous novel -- and can recommend this as an enjoyable mystery story.