Book excerpt: In The Scientist and the Forger: Probing a Turbulent Art World the author draws upon an enthralling range of case studies, from Botticelli to Leonardo, Campendonk to Pollock and Chagall to Freud, equipping the reader with a holistic understanding of an art world shaped by fast-moving trends, and increasingly permeated by science. We are taken on a gripping journey, becoming witness to the attempts currently being made to safeguard a partly complicit art market virtually under siege. How can we determine whether it was Leonardo's hand that created Salvator Mundi? How can we prove that a suspected Pollock is a forgery? And how can Man in a Black Cravat be seemingly incontrovertibly attributed to Lucian Freud, despite this artist's adamant refusal to recognize it as one of his own? This book reveals how art historians and scientists collaborate conclusively to authenticate paintings or demonstrate that they are forgeries, and as the enigma of La Bella Principessa continues to baffle, the question remains: do we have enough reason to hope that we shall one day know her true story? Building on the first edition, a more in depth look is taken at some of the greatest scandals to date -- with an interpretation of the psychological behavior of Ann Freedman the former president and director of the Knoedler Gallery.