“Sayen: Desert Road (Sayen: La Ruta Seca)” is a Chilean B-movie thriller about the further adventures of activist/investigator and freedom fighter Sayen, a two-fisted Mapuche woman plunging into a Big Conspiracy destroying her people and and enriching the corrupt in her native Chile.

We met the title character, played by Indigineous action heroine Rallen Montenegro, in “Sayen,” the story of how she was radicalized when murderous multinational corp-hired goons killed her wise grandmother, sending the title character on a quest for revenge and justice.

“Desert Road” has her breaking and entering, torturing, fighting and digging her way towards the top of this water-stealing, lithium-minining, politician-buying pyramid. She is a woman who has shaved her head to show us how serious she is on this mission. She has her grandmother’s spirit, embodied in an Andean Condor, to guide her.

Sayen has been labeled a “terrorist” by the compliant media, which buys into the spin that GreenCorp, its villainous boss Maximo Torres (Enrique Arces) and bought-and-paid-for Chilean senator (Alfredo Castro) are putting out there. Disappearances and murders are laid at her feet, not theirs.

Hunted and hounded by company muscle, chased on foot, motorcycle and ATV through the Atacama Desert, she relies on her native wits, stamina and fighting skills to save her.

There is help along the way — her Mapuche researcher friend Jose (Camilo Arancibia) is back from the first film. Another woman, Quimal (Katalina Sánchez) pitches in on getting Sayen safe houses and getaways as she sniffs around for the truth.

The villains call her “the Indian” (“dusky woman,” in Spanish, but this is dubbed on Amazon) as she tries to foil their plans for sucking up the desert’s aquifer to mine lithium for the batteries that will power the “green” or at least “greener” future.

Director Alexander Witt’s sequel never feels like anything more than a placeholder film for I guess a third installment in this trilogy.

The action beats are solid, but character development is pared down from the introductory film. Unseen third act “allies” and the elusive, still unseen Mr. Big (Fisk) are hinted at.

But for everything resolved here — and precious little is — more that must be resolved in the finale is introduced and left hanging.

The dialogue, situations and heavies are B-movie formulaic and utterly unsurprising.

Montenegro helps make Sayen a compelling character with an unusual, seldom-filmed point of view. But the movie pulls her punches. I’d love to see her as a more ruthless avenger, frankly.

In any event, if all involved were hoping they’d serve up enough to keep viewers interested enough to await the third film in this saga, they failed.

Rating: unrated, violence, profanity

Cast: Rallen Montenegro, Enrique Arce, Katalina Sánchez, Camilo Arancibia, Eyal Meyer and Alfredo Castro

Credits: Directed by Alexander Witt, scriped by Leticia Akel and Paula del Fierro. An MGM/Amazon Prime Video release.

Running time: 1:33