Eager to revive her investigative journalist chops after her second daughter's birth, Tina Thomas and her fellow sleuthing stay-at-home moms are back, uniting in their attempts to save the day - and each other. brainy-BOOM , the fourth book in the Hamlin Park Irregulars series, begins when Tina's editor husband asks her to interview a Russian investor who's lost his clients' money. The routine assignment goes awry when she finds the man dead...