The book begins with the front-engined Birdcage Maserati competition history from the middle of 1959 until the end of 1960, covering World Championship, professional USAC and Nassau Speedweek racing. From there it progresses into chapters covering the development of the first rear-engined Birdcage Maserati at the end of 1960 and the background of the private team owners who bought the first production cars: Briggs Cunningham, Count Giovanni Volpi and Lucky Casner.
From then on each chapter covers a event in which these cars were raced, ranging from the World Championship rounds to the U.S. racing scene as sponsored by SCCA [amateur] and USAC [professional], and including the British Nassau Speedweek at the end of the year. The subject period covered is 1961 to 1965. Each race report includes a complete entry list, complete starting grids and complete results. This is information never published beyond the WSCC events and of great historical value.
He also wrote four books about competition Maseratis, three co-authored with French enthusiast Michel Bollée. Oosthoek’s 2004 book Birdcage to Supercage: The Rear-engined Tipo 63, 64 and 65 Maseratis., and the 2008, Maserati Tipo 60 and 61; The Magnificent Front-engined Birdcages, written with Michel Bolleé, are the defining history of the Maserati Birdcage racing cars. His book on Sports Car Racing in the South, won the Society of Automotive Historians' Cugnot Award in 2012.
Willem Oosthoek is a recognized authority on the subject of competition Maseratis and is often consulted by private owners, museums and auction houses.
His latest book which was published in early 2013 is Sports Car Racing in the South, 1959-1960.