1970s David Cassidy craze, and centering around his infamous White City concert (OK, I wasn't born yet, but I've seen the "Behind the Music"), it's the story of a British group of girls from Wales, but it could be a tale of any pre-teen peer group, fraught with intrigue and more social maneuvering and potential protocol land mines than a U.N. security meeting. The rampant desire to fit in and be noticed, but not to stand out (heaven forbid). The longing for boys, but the complete and utter fear of actually speaking to a live one. ... It's a pitch perfect portrait of female dynamics and coming of age. And, in part two, Pearson explores another era of transition, middle age, complicated by love, loss, divorce and motherhood. All of which is a perfect counterpoint to the now quaint-seeming, but at the time life-altering, drama of the teen years. And how you never quite get over your first real crush. There's also a sweet David Cassidy-related romance brewing (set up in part one, it comes to fruition in adult Petra's story). Allison Pearson nails with unerring veracity all the emotions of both a 13-year-old and 30-something woman and, as a fan herself, has her Cassidy lore down cold. (Pearson even includes a transcript of her 2005 interview with the real Cassidy, which inspired the novel, at the end of book.) Inside of every woman, that 13-year-old girl still exists. And this way-past-pubescent mom loved every minute of "I Think I