Invisible Threat
Years ago, a classified black ops program called ASH ran quietly in the shadows of Eastern Europe, experimenting on human subjects, extracting memories, and pushing the limits of what was thought permissible. Then it was shut down. It was buried and forgotten. And then it wasn't. One by one, people connected to the project are turning up dead. Accidents, overdoses, and murders with no suspects. Over a dozen names were on the list, and now... only a handful remain. Aaron Holt is one of them. Now Holt is racing across Europe, trying to reach the survivors before someone else does. Someone has a personal score to settle. Someone who's working through the list, with no intention of stopping until every last name on it is gone.
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Mike Ryan
Mike Ryan is a USA Today bestselling author known for crime fiction and fast-paced thrillers. He is the author of multiple series, including The Silencer, The Extractor, The Eliminator, The Nate Thrower series, and The Aaron Holt series.
In addition to his novels, Mike has adapted several of his books into screenplays for television pilots and has written a stage play. He lives in Bucks County, Pennsylvania, with his wife, Liz, their four children, and two dogs. He is always writing the next story.
Aaron Holt
Aaron Holt consists of four books and series is set to expand with the upcoming release of one more book. The current recommended reading order for the series is provided below.

