Burgos, Spain, Christmas Eve 1257. Princess Kristina Håkonsdatter of Norway arrives in the city en route to Valladolid in order to marry Alfonso X the Wise, since Queen Violante had failed to give birth to a male heir to the Castilian throne. Eight centuries later, Carlos Lafuente, a devoted paleographer from Montanilla University, is tasked with preparing a report on the validity of some manuscripts discovered near Silos Monastery. What he couldn't anticipate was to what degree this ordinary task would alter the course of his life. With the assistance of Arthur Trevelyan, a postgraduate student, and Elena Serna, a colleague in the same paleo-graphic department, the trio will investigate the cryptic clues discovered there, relying primarily on their instincts. Present and past will intertwine like invisible knots that Arthur prefers to qualify as "significant coincidences"—the invisible threads that move the world bringing the small group of scholars to a surprising conclusion in a gripping and moving story full of intrigue, humour, love and adventure. A story that reads as a tale under the rain.