'Dot.Con': One Is Born Every Minute "Unfortunately, Cassidy ends up closing the book in much the same way he opens it -- with a forced march through yesterday's business pages. He reminds us about forgettable moments like the collapse of Pets.com and all the various days on which the market rallied and dipped and died. Like a lot of dot-coms, Cassidy started out with a potentially winning concept. But he made a critical error when he attempted to make his book a ''category killer,'' an epic tale that would render all competing dot-com tales obsolete. There are just too many elements of the sprawling history about which he has little new or profitable to add."