Conquest, John (1990). Trouble Is Their Business: Private Eyes in Fiction, Film, and Television, 1927-1988. New York: Garland Publishing. p.74. ISBN0824059476. "Fast is best known as Cunningham for his Masuto books, but Alan Macklin is a small-time investigator hired by a multimillionaire on the eve of the wedding to find out who his prospective bride really is. Harvey Krim is an insurance investigator, and, in his superior's words, 'cynical, nasty and unreliable and utterly unprincipled. The only thing that can be said in your favor is that you have brains,' and his style is very Pi-like. See Films: SYLVIA." Macklin: Sylvia (1960); Krim: Lydia (1964), Cynthia (1968)
Husband, Janet G.; Husband Jonathan F. (2009). Sequels: An Annotated Guide to Novels in Series. Chicago, IL: American Library Association. p.201. ISBN978-0-8389-0967-6. "Masao Masuto, Beverly Hills' Japanese American detective, is a Zen Buddhist. His wily and tenacious cast of mind helps him sort out some complicated cases, and his knowledge of karate comes in very handy at times. Beverly Hills is too small and peaceful a town to have a permanent homicide squad, but when a case involves possible murder, Masuto and his partner Sy Beckman take over."
