Stranded in the middle of Peru, a travel writer and an archeologist find themselves caught in a race against a familiar foe for an enchanted artifact (and maybe even falling for each other along the way.)

What is the main character goal and who or what is the opponent? where does the conflict come from?

>>a travel writer and an archeologist

It's usually better to designated one protagonist.? Having dual protagonists implies that the story is heavily reliant on the relationship, the chemistry that already exists or will develop between the 2 characters.? In any case, a logline, particularly in this genre, is not about the relationship, it's about the call to adventure, the objective goal of the protagonist.? So...

>>>(and maybe even falling for each other along the way.)

should be left out.

>>find themselves caught in a race

Passive and reactive.? The story?is driving the character, when the character should be driving the story.? A logline is about an inciting incident( a discovery or?a situation that upsets the status quo, in this case "being stranded in the middle of Peru") that motivates the?protagonist to?proactively pursue an objective goal.? In this case?the enchanted artifact.

>>against a familiar foe

Vague.? Be specific.? Characterize the antagonist in a way that conveys the sense that he or she represents a clear, credible and present threat, someone who can defeat the ambitions of the protagonist.

fwiw