A #1 best-selling thriller on audio, free.

"Fast-paced, edgy science fiction adventure."

"First book was excellent,

second even better!"

"Fast-paced, edgy science fiction adventure."

Thousands of fans around the world

"Not just a 'good guy vs bad guy' story."

The Call Sign: Raven Audiobook Trilogy

...from Jeffrey Poston 

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"Aliens and assassins at every turn!"

"Perfect for sci-fi fans who crave depth of character."

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About the author

Across the multiverse, extinction has a predator—Raven

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