'The Beginning of the War of ...'
Rich knows about Arthur Bernon Tourtellot's
'Lexington and Concord' and makes another recommendation:
I have the book -- get it!
It's a great read and very informative. Among other things, you'll be amazed at what a comedy of errors it was on the British side.
Another great book on the Revolution is "Spirit of 'Seventy Six", edited by Henry Commager Steele. It's a collection of (edited) letters from participants in the war -- everything from people at home, to soldiers, to generals, to MPs and the King.