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Covert Threat (Gray Ghost Novel, book 5) by Amy McKinley—a romantic thriller that will keep you guessing until the end.
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After an elite research facility reports a security breach, former Navy SEAL Trev Shaw is hired to guard a workaholic scientist. When he saves the gorgeous but frightened doctor from a boating mishap, sparks fly. It’s supposed to be an easy mission, but then his heart and mind get tangled in the danger surrounding her. 

When infectious-disease specialist Jules Moretti is plagued by strange incidents she’s paired with their pilot-turned-bodyguard to ensure her safety while working on top-secret projects. As they grow closer, she learns there’s more to her protector than she first assumed. But then threats escalate, and she realizes that some things are better left buried. 

When an unknown attacker threatens Jules, Trev works to reveal the true culprit and unmask whetherthe danger coming after her is personal or a smokescreen for biowarfare.

Amazon US: https://www.amazon.com/dp/B07Y26GD7C/
Amazon UK: https://www.amazon.co.uk/gp/product/B07Y26GD7C/
Barnes & Noble: https://www.barnesandnoble.com/w/books/1134002040
iBooks: https://books.apple.com/us/book/covert-threat/id1482940690
Kobo: https://www.kobo.com/us/en/ebook/covert-threat
UBL: https://books2read.com/u/mZBdql