Travelling to Peru to rescue Calculus, Tintin, Haddock and Snowy encounter danger in several guises, chiefly taking the form of secretive native Southern-Amerindians, or the flora, fauna and landscape of this - for Northern Europeans - far-flung and excitingly exotic region.
I think this is, in places, the most visually beautiful Tintin adventure so far. It's not just the wonderful clarity and economy of the line work, but also the famously fussed over colour palette. The epic journey through mountains and forests to the Temple Of The Sun is just deliciously fabulous, the gradual colour evolution as the protagonists move through the varied environments really whisking one off to an imagined South-America.
Criticisms of this as escapist may have more than a grain of truth in them. But to me they miss the point: some people do angst-ridden self analysis and social commentary (Robert Crumb, let's say), others tell ripping good fantastical yarns, and perhaps sometimes some do both. And then some are just plain dotty, like George Herriman. As long as it's well done, I've got time for them all. An analogy might be food: do you always and only want to eat salad, or do you sometimes like to indulge in a scrumptious dessert?
Personally I find this utterly appetising: please Mr Hergé, may I have some more?