The Piltdown man fraud of the early twentieth century still gets scientific knickers in a twist, but the reason it worked so effectively is because so many people wanted to believe it.
Walsh gives the historical context and details how it was perpetrated. When he points out how the skull fragments were found (i.e. explicitly where and under what circumstances) it becomes difficult to see why the myth was not exploded sooner.
I don’t know much about fossils or anthropology, so I learnt a lot from reading this. It is a book I will return to again, I am sure.