The Sacred Well by Antoinette May

A young reporter in 1923, Alma Reed accompanies archaeologists to the ruins of Chichen Itza, where a fortune in Mayan artifacts has been stolen from a sacrificial well. It's believed a curse was unleashed by the theft—yet the career-making story it offers the ambitious journalist seems a godsend. It also leads her to a passionate love affair with revolutionary governor Felipe Carrillo Puerto. But when fate darkens their lives and damns them as doomed political pawns, Alma can't help but wonder if the curse is not, in fact, very real.