Wicked Deeds on a Winter’s Night ~ Kresley Cole

This is the fourth book in the Immortals series.

Bowen has been mourning his mate for a hundred and eighty years. Trying to find a way go get her back. When suddenly, during the Hie, a Lore treasure hunt that occurs every 200 years, he is drawn to another, almost as though he were given a second mate.

Mariketa is competing in the same hie, even though she has not yet reached immortality, and her magicks are unstable. After Bowen becomes convinced that she bewitched him to want her, he traps her in a Mayan tomb. After 3 weeks of being trapped and giving up on someone coming for her Bowen appears, he pulls her from the tomb, only to demand that she remove the curse she put on him when he trapped her.