NEW YORK -- Mena Suvari wants to explain her reasoning for writing about Kevin Spacey on the set of their 1999 film “American Beauty" in her new book “The Great Peace" (Hachette).Spacey won an Oscar for his role in the film as Lester Burnham, a suburban husband and father in the midst of a midlife crisis, who becomes fixated on his daughter’s best friend, Angela, played by Suvari.On the day of filming a scene where Lester and Angela lie on a sofa together, Suvari writes that at set, Spacey took