Washington Post "Review"

We've gotten nothing but great reviews on Casanegra, but here's one that puzzles me. It was in the "Washington is also reading" section (is that a section?) and reads:

Washington Is Also Reading

Sunday, July 29, 2007; Page BW14

CASANEGRA: A TENNYSON HARDWICK NOVEL

By Blair Underwood with Tananarive Due & Steven Barnes


(Atria, $25)

That's right. Three authors. Does that make for a better yarn? Well, that's for you to decide, but with the caliber of talent on hand -- an award-winning actor and two novelists, each boasting an impressive résumé -- the odds are auspicious. Their protagonist, semi-profitable actor and recovering gigolo "Ten" Hardwick, unveils a new talent hidden beneath his hunky exterior -- detective. And not a moment too soon, as he finds himself the prime suspect in the death of rap star Afrodite, who went from former client to potential sweetheart after their recent rendezvous. Hardwick's hunt for the killer takes us on a roller-coaster ride through Hollywood (with tidbits about the evolution of black films), the rap world and the sex-for-pay industry. Hold on, there's bound to be some turbulence. (F)
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Now, I'm puzzled about the parenthetical "F." I'm guessing that it relates to a reviewer's name. If it's a grade, that opinion certainly isn't reflected in the review itself. Anyone out there familiar enough with the Washington Post to help me figure out what the "F" means? If it IS a grade, I can live with that, but seems weird...