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Summary:
BOOKS ONE, TWO AND THREE OF THE "GIRL UNDERCOVER" SERIAL:

LAPD Detective Gabi Longoria returns home one night to a nasty surprise—her husband has been brutally killed. A note next to his body says: “Rats always get what they deserve.”

Her captain refuses to let her join the murder investigation, so Gabi decides to do her own. Convinced the reason to her husband’s death can be found at the New York health club where she met him, she goes undercover as a trainer there.

In the process of seeking the truth, she meets a handsome, mysterious man who claims an evil corporation killed her husband—what’s worse, he also claims they’ve developed a master race to replace all of humankind…