Chalupa Conundrum

Private investigator Tag Finn, a former special operations soldier and member of the CIA's elite Special Activities Division, is having a nice quiet evening at home until his phone rings, and he answers it to hear the voice of his beloved ex-girlfriend Estelle pleading for his help. She abruptly screams, the line goes dead, and the next morning Finn learns that Estelle and her entire group of UCLA archeologists have gone missing from their dig site at the mysterious Chalupa Ruins in Costa R...