Kurt Andersen, 'True Believers'

You can get this book here.  I can't tell you that much about the plot without spoiling it, but be assured that it is a cracking read.  It's set in the 1960s,  not among hippies but among radicals, of a kind, in America, who are very young.  It is about friendship, and memory, and lies.  The writer is a man, and has created a terrific female lead character, a kind of sexy grandma.  Perhaps the book, when it is not a political thriller (which it is, a lot of the time) is a study of the danger of being certain about what is and what is not.  As an aside, kind of, I discovered from this book that only one film has ever been made entirely in Esperanto.  It was called Incubus, and starred - William Shatner.  You can see a clip here.  Looks terrific.  Although I object to Esperanto as pointless.