When Michael Holroyd's life of Strachey appeared in 1967, it changed the course of modern biography, setting a new standard for the recounting of literary lives and launching the enduring Bloomsbury revival. In the 1960s, however, many of Strachey's friends and lovers were still alive; much could not be said, and access to letters and resources was restricted. Since then, almost all his circle has died, and homosexuality in England has been decriminalized...