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Drew, Mr. Leavelltold him, this is good.

“That was one of those moments you have a daydream about it happening,” Mr. Magary said. “The person who reads your book is spellbound and amazed. I was jazzed.

“Then he told me that the whole second half of the book was wrong. And a lot of the first half. So I had to go back and learn how to write a novel while rewriting it.”

But while writing his debut novel was a bear, selling it’s been a breeze for the veteran blogger, thanks largely to an ongoing business shift that has seen publishers scale back traditional, store-and-print-based advertising campaigns in favor of digital messaging.

In the weeks leading up to “The Postmortal’s” Tuesday release, Mr. Magary wrote guest posts at popular websites The Awl and the Huffington Post. He gave interviews to a number of science-fiction blogs. He reached out to his 20,000 Twitter followers. He wrote the voice-over script for his book trailer, directed by Brian Spinks. He even made a trip to the annual Comic-Con film and comic book convention in San Diego - ground zero of American geekdom - where he participated in a panel discussion about immortality.

Meanwhile, Mr. Magary’s traditional book release tour consisted of exactly one stop: a Wednesday night reading at the District’s venerable Politics and Prose bookstore.

“They don’t do those anymore,” he said. “They don’t throw book parties anymore. All the publishers figured out it makes no sense to pay thousands [of dollars] to send you on a tour to sell 15 books in a store.”

Reluctant to share specific details, Mr. Magary said he already has begun work on his next novel. Channeling his childhood screenwriting ambitions, he previously hoped that “The Postmortal” would be optioned for a big-screen project - that is, until he saw a magazine article about “In Time,” an upcoming Justin Timberlake movie featuring a society in which no one grows older than age 25.

“There’s also a show, [Starz’s] ‘Torchwood: Miracle Day’ that came out a month ago,” Mr. Magary said, shaking his head. “It’s about a world where everyone is immortal.”

He laughed.

“I thought I had a decent idea,” he said. “But now, I doubt there will be a ‘Postmortal’ TV show.”

On the other hand, there will always be a trailer.