When novelist Patience McKenna takes a job at a dubious publishing house, a corpse in her closet has her searching for the true crime culprit.   Writing Enterprises makes Patience McKenna sick. A onetime romance novelist, she has recently vaulted into the arena of true crime--a happy side effect of being too close to a high-profile murder. Writing Enterprises preys on wannabes, offering vanity publishing, bogus "literary services," and, worst of all, the insipid Writing Magazine. When Writing profiles several of McKenna's novelist friends, they want someone they trust to edit the copy. With great hesitation, McKenna takes the job. She's only been in the office a half hour when a corpse falls out of her closet.   Clearly, Writing has some skeletons in the closet. McKenna has never liked this company, but now that she knows there's a killer in the office, she has no choice but to take him or her down.