Found in the Lost by Tarina Deaton

Crypto archaeologist, Kinley Dunn accomplished the impossible; translating an ancient Mayan text that stumped experts since its discovery hundreds of years ago. Rumored to hold the key to a vast and priceless treasure, Kinley is determined to be part of the discovery until she finds herself stranded in Guatemala without a way to reach her mentor.
Former SEAL Shane Ivers is searching for his purpose, but on this trip his only goal is to relax and catch up with his old teammates while exploring ancient Mayan ruins. What he didn’t count on was the smart and beautiful Kinley falling at his feet—literally.
An offer of a ride turns into a dangerous, heart-pounding trek through the jungle, while a simple vacation attraction develops into something deeper. With the help of The Leonidas Corporation, they’ll race to find the lost Mayan city, but there’s more at stake than priceless treasure and Kinley and Shane could lose more than they bargained for. Because someone wants the secret Kinley holds and will do anything to get it.