"Davidson’s chick-lit series featuring a shoe-obsessed vampire, claws its way to No. 15 on the hardcover fiction list this week. Davidson’s titles are relentlessly negative — “Undead and Unwed,” “Undead and Unemployed,” “Undead and Unappreciated,” “Undead and Unreturnable” — but the author herself, who lives in Minnesota, comes off as unflappably undepressed, not to mention just as feisty and foul-mouthed as her characters. A few years ago, Davidson had some choice words in response to an interviewer’s question about the stigma attached to romance novels: “Look, you’ll never ever see a man apologize for what he’s reading. Ever! He could be reading, oh, I dunno, yet another book in the Executioner series” — the hardware-heavy pulp series that has sold some 200 million copies worldwide since 1969 — “and he’s certainly not going to apologize to the gal sitting next to him in the subway. And why the hell should he? He’s reading a book, he’s not hurting anybody. So why do we feel like we have to explain ourselves if a panting, heaving, naked-to-the-waist Fabio is on the book cover?”