On the Rio Curi-Yacu, engineer Mateo Rojas joins the dredge barge Perforadora to clear a channel for corporate traffic and finally earn enough money to outrun debt. The work is brutal, the river stubborn, and captain Lucho Vega impatient with anything that slows profit. When the crew uses explosives to blast through a sandbar that locals would have left untouched, they do not simply open a route. They cut into something sleeping beneath the riverbed, and the water answers in blood-red plumes, wrong voices, and a current that begins forgetting its own direction.
What follows is not an ordinary river disaster. The men aboard the Perforadora begin hearing dead relatives in the fog. Diver Mono Ruiz comes back stained by a red residue that will not wash off and starts speaking names he should not know. Serena Valdez finds protein and vascular structures in what should be simple sediment. Maruca, the old galley woman who still knows the river's older rules, understands the truth before the others are willing to admit it: they have wounded not mud, but a living current intelligence, a river-being the old stories call Yacumama.
As the river reverses, maps fail, memory thins, and the crew is dragged toward an older ritual of silence and debt, The Veins of the Yacumama becomes a psychological folkloric horror novel about extraction, river hunger, and the terror of discovering that some places do not merely resist exploitation. They keep account, and they collect.