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An ex-Navy SEAL searches Missouri caves for a missing young woman in this romantic suspense adventure by a USA Today-bestselling author.

Former navy SEAL Alan Burke is on the trail of a serial killer—and determined to protect Jo Summerlin. As stubborn as she is beautiful, she insists on following a hunch into the limestone caverns snaking beneath Missouri. They both know that they may be descending into a monster’s lair. To get Jo out alive, will Alan have to make the ultimate sacrifice?

From Harlequin Intrigue: Seek thrills. Solve crimes. Justice served.