K now thy audience’ some high priest of media now lost to the mists of time once preached, and Geeks, Girls and Secret Identities, Blogger Mike Jung’s freshman novel for middle-grade readers packed with heavily-capitalized text and brightly-colored illustrations, serves that sentiment with near-religious devotion in content as well as presentation. Geeks’ hero, 12-year-old Vincent Wu, is president of the smallest but most sincere Captain Stupendous fan club in Copperplate City. Stupendous, a real-life superhero, keeps Vincent’s hometown safe from all manner of villainy, domestic and extraterrestrial. Vincent and his two-man posse can tell you anything you might want to know about the habits and history of their superhero of choice. Well, it’s pretty much all they’ve got going on, really, until the arrival…