Really enjoyable, if you could use that word in connection with this subject. Reads like a fast-paced thriller -- with entire chapters covering time spans of as little as 15 minutes. Also superbly researched with a strong and successful effort at achieving balance, including presenting the reader with contradictory evidence along with a judicious weighing and balancing of that evidence.

As the title indicates, the book focuses on the President Johnson's first day in office, starting with being thrown to the ground in his limo by his alert secret service protection and ending with a series of photo-op meetings with his team in the Oval Office and what appears from the pictures to be the Roosevelt Room. In between, Johnson has to make rapid judgments under enormous uncertainty -- while balancing the need to project continuity with the importance of not appearing greedy or ambitious to a nation deeply in mourning for Kennedy.