The main three, intertwined components of the book that I observe are a battle study of the fighting near Monmouth Courthouse, an analysis of the political challenges to George Washington before the battle vs the consolidation of his commanding role after the battle, and an investigation to challenge and revise the historically poor reputation of Charles Lee and his performance during the Battle of Monmouth.
Ever since the Battle of Monmouth ended popular opinion has sought to denigrate Charles Lee for his actions during the battle. The book mentions how at a centennial celebration of the battle in 1878 a speaker at the event devoted more than 10 pages of his speech to "General Lee's Incompetency." Even in recent years Charles Lee has appeared in the video game Assassin's Creed 3 (2012), the tv show TURN Washington's Spies (2014-2017), and the Broadway musical Hamilton (2015), all of which I happen to personally enjoy, but in all of which Lee is actively cast as a villain. In those works of pop culture as well as by an untold number of history writers, Lee's performance at Monmouth is regularly portrayed as gross incompetence if not outright treachery.
This work seeks to patiently reexamine Lee, his character, and what really happened under his watch at Monmouth. From looking at the sequence of events, the book posits that while Lee was the head of a frustrated situation on the morning of June 28, Lee was only at fault for not being more clear with his orders and likely en route to restoring the situation for the Continentals, atleast partially, when General Washington arrived on the scene. Lee's virulent accosting by Washington is also largely apocryphal. Washington was certainly frustrated and Lee was duly unnerved by the tone of Washington's unexpected interrogation, but Washington's rage did not 'tremble the leaves on the trees,' nor was Lee ordered to the rear of the army. Seeking to redeem the morning's mistakes, Lee immediately sought to make a critical holding defense to buy time for Washington to form the main army on the high ground of Perrine Hill that Lee himself had previously chosen as an optimal location for his command to reform.
So why does everyone hate Lee? I mean aside from his poor disposition, volatile temper, lack of social grace, slovenly appearance, philandering habits, and inability to stop talking (or writing) when it was prudent for him to do so... Aside from all of those things Lee was also known to be critical of George Washington's role as commander of the army. While Lee's esteem fell after the battle, Washington's rose with the aid of newspapers, pro-Washington members of Congress, and Washington's own "military family" of talented young aides including Alexander Hamilton, John Laurens, James McHenry, Tench Tilghman, and others. Up to this point in the war Charles Lee was held in such high regard by both sides that it was politically impossible to remove him. But in the aftermath of Monmouth, Lee sought a court martial to formally exonerate his conduct, a common tactic of military commanders whose honor had been questioned. However, this provided the crucial opportunity for the supporters of Washington to be rid of Lee.
One can almost imagine Hamilton, Laurens, and McHenry wearing pink and telling Charles Lee "you can't sit with us." Washington for his part never publicly denounced Lee, nor did he have to. Washington played no direct influence when Congress ruled that Lee had disrespected his superior officer and was suspended from command for one year. But after years of doubts about whether Washington was the best man to lead the Continental army, his position was now thoroughly consolidated. Though Charles Lee didn't deserve public reprimand for his role at Monmouth, he did have a genuine pattern of creating animosity among the Continental high command. It's possible that his removal was better in the long run, instead of allowing the friction of his criticisms and conduct to sow an ever increasingly toxic environment in the Continental army.