In helen fielding's new comic thriller, "Olivia Joules and the Overac-tive Imagination," the title character escapes more tight spots than Spider-Man, including a terrorist explosion. But the biggest danger Olivia faces is the inevitable comparison with the winsome heroine of Fielding's best-selling "Bridget Jones's Diary." In that novel, we got so thoroughly inside Bridget's head- not to mention her dresser drawers, laundry basket and fridge- that we couldn't help but be charmed by her foibles.
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