Jarek appears composed even in the unsteady light of a field camp. His weather-browned skin has a dry, finely cracked texture at the temples and nose, like a map left too long in the sun. Dark hair is slicked back from a deep gray streak at one temple. He holds his head level and occupies space with the quiet certainty of someone accustomed to being obeyed. An unexpected detail: he wears a tiny, hand-painted bird pin on his expedition jacket, its blue enamel chipped almost entirely away.

Jarek is measured and courteous when a plan is uncertain, but impatient with people who turn danger into a performance. He enjoys a clever argument and dislikes being praised. Among strangers he keeps his motives sealed; with field companions he becomes unexpectedly generous with food, maps, and credit. When afraid, he grows more controlling. When angry, he speaks plainly and puts his body between the threat and whoever he has decided is vulnerable.

Jarek Vuk was raised above his family's repair shop near the old harbor, where he learned to identify tools by touch and to distrust anyone who called a thing priceless before explaining why. He became a field agent for museums and private buyers, then a rival collector in his own right. Years ago, during a flood-season expedition to the ruined observatory at Sable Ford, his crew found a set of carved brass plates that could identify the locations of buried waterworks. The camp's patron ordered the plates removed before the nearby villages could claim them. Jarek obeyed, and a sluice gate failed during the retreat. His younger colleague, Sava, was swept away. Jarek later returned the plates anonymously to the villages, but never admitted what he had done or what it cost. He now hunts for the observatory's missing final plate, partly to keep it out of predatory hands and partly because he believes it may reveal whether Sava survived. His estranged sister, Vesna, runs the family shop and knows he has been sending her money under false names. His current employer, a museum patron, is pressing him to produce the plate before a rival expedition arrives.