Several large publishers declined to speak on the record about Amazon’s efforts. “Publishers are terrified and don’t know what to do,” said Dennis Loy Johnson of Melville House, who is known for speaking his mind.

“Everyone’s afraid of Amazon,” said Richard Curtis, a longtime agent who is also an e-book publisher. “If you’re a bookstore, Amazon has been in competition with you for some time. If you’re a publisher, one day you wake up and Amazon is competing with you too. And if you’re an agent, Amazon may be stealing your lunch because it is offering authors the opportunity to publish directly and cut you out.

“It’s an old strategy: divide and conquer,” Mr. Curtis said.

Amazon executives, interviewed at the company’s headquarters here, declined to say how many editors the company employed, or how many books it had under contract. But they played down Amazon’s power and said publishers were in love with their own demise.

“It’s always the end of the world,” said Russell Grandinetti, one of Amazon’s top executives. “You could set your watch on it arriving.”

He pointed out, though, that the landscape was in some ways changing for the first time since Gutenberg invented the modern book nearly 600 years ago. “The only really necessary people in the publishing process now are the writer and reader,” he said. “Everyone who stands between those two has both risk and opportunity.”