Luke Burgoa is an ex-Marine on a solitary covert mission to infiltrate the Basque separatist organization ETA in Spain and help bring down its military commander, Peru Madariaga. Luke hails from a Basque ancestry that came with the Spanish empire to Cuba, Argentina, Mexico, and, seventy-five years ago, to a Texas ranch. Luke’s orders are to sell guns to the ETA and lure Peru into a trap. Instead he falls in love with Peru’s estranged wife, Ysolina. From the day they cross the border into the Basque Pyrenees, their love affair on the run conveys the beauty, sensuality, exoticism, and violence of an ancient homeland cut in two by Spain and France. Their trajectory puts Luke, Ysolina, and Peru on a collision course with each other and the famed American architect Frank Gehry. Ranging from the Amazon rain forest to a deadly prison in Madrid, Sins of the Younger Sons is a love story exposed to dire risk at every turn.