The Paris National Museum of Natural History has two closely linked roles in the novel: it preserves a vast material record of the natural world, and it becomes a site where wartime secrecy, displacement, and the uncertain custody of precious objects converge. Its galleries and catalogues make the scale of institutional knowledge visible, while the evacuation of collections and search for the Sea of Flames expose how fragile that order can be. In the years after the war, the museum is also the setting for Marie-Laure LeBlanc’s sustained scientific work, a life shaped not only by preserved specimens but by living mollusks and the people who come to study them.

Collections and Institutional Memory

The museum’s holdings range across fossils, ancient manuscripts, minerals, and other valuables. As war approaches, staff work late to protect them: crates are padlocked, transport manifests secured, and a small group of couriers begins moving objects to country estates. Armored trucks arrive at the loading docks. The threatened collections include jade, cavansite, rhodochrosite, pearls, gold nuggets, and a large sapphire. Marie-Laure wonders whether the Sea of Flames may also be among the objects at risk. The preparations make preservation a practical and urgent undertaking: objects must be packed, documented, locked, and transported while the city’s apparent springtime calm gives way to mounting tension.

The museum’s mineral collections convey a longer history of classification and accumulation. When Reinhold von Rumpel tours the Gallery of Mineralogy, many display cases are empty. The shapes left on their felt shelves mark what has already been removed, so even absence becomes evidence of the evacuation. Among the minerals still on view are yellow topaz crystals, pink beryl, tourmaline from Madagascar, bournonite, apatite on muscovite, and natural zircon. The gallery’s breadth impresses von Rumpel, who recognizes that the staff handle more gemstones in a week than he has encountered in his lifetime.

The collection is supported by records accumulated over generations. Its large folios register individual pieces and preserve an institutional history reaching back to Louis XIII, when the collection began as a Cabinet of Medicines, with materials associated with remedies for ailments. By 1850, the catalogue already contained two hundred thousand entries. This history gives the museum’s objects more than monetary value: they are held within systems of description, classification, and custody. At the same time, the wartime dispersal means that the records and the objects may no longer be together or readily accessible.

Evacuation and the Sea of Flames

The museum’s protection plan also governs the uncertain movement of the Sea of Flames. The director arranges for three replicas to accompany the real diamond, creating four stones in all. One is to remain at the museum; three are to travel in different directions, including one carried by Daniel LeBlanc, the museum’s principal locksmith, in his tool case. The director’s policy is that no carrier should know whether the stone in their possession is genuine, and each should behave as though it is. Daniel tries to believe that his stone is a copy, but its size and blue glow keep the possibility of carrying the real diamond alive for him.

The distinction between original and replica remains uncertain in the evidence available to those pursuing the stone. In the two months before the invasion of France, a craftsman named Dupont makes three replicas from a casting; he has never seen the real diamond. Von Rumpel accepts this account, but it does not tell him which of the four stones is genuine or where the others have gone. The museum’s dispersal plan thus protects the diamond by multiplying uncertainty, while also turning that uncertainty into the engine of a continuing search.

That search reaches the museum’s concealed spaces. Von Rumpel first surveys the public mineral gallery and asks about collections that are not on display. A small locked door at the rear of the gallery leads down a winding stone staircase; further gates and corridors lead to a storeroom of dropcloths, pallets, and crates. Behind plywood, a simple combination safe contains a second, heavier box. The route requires multiple keys and access through restricted rooms, yet the account notes the absence of an alarm and the presence of only one guard. The contrast between the museum’s carefully accumulated records and the vulnerable procedures protecting its hidden holdings sharpens the danger: knowledge of the collection does not itself guarantee the safety of what is collected.

A Site of Search and Disrupted Custody

Von Rumpel’s visit turns the museum into a place of inspection as well as preservation. He arrives before dawn, formally dressed, carrying a loupe and tweezers, and is shown the collections by staff. His attention moves from the public displays to the objects removed from view, then to the secured spaces below the gallery. The progression follows the institutional layers through which an object might pass: exhibition, catalogue, storage, and locked containment. Yet the search does not resolve the diamond’s provenance. The museum is one point in a wider chain of custody, not a place where von Rumpel can simply identify the genuine stone and end his pursuit.

The institution’s wartime history is also connected to Daniel’s work and disappearance. The museum’s director sends him away carrying one of the stones, and Daniel’s tool case and architectural notebook later become objects of suspicion when he is seized outside Vitré. He explains that the keys are for the museum where he works and that the model he has measured is for his daughter. Despite later research by Marie-Laure and Etienne LeBlanc, the available records establish only that Daniel was imprisoned at Breitenau in 1942 and that a camp doctor recorded his influenza in early 1943. The museum’s connection to the diamond therefore sits beside a larger archival gap: its own arrangements can be described, but they do not supply the missing account of what happened to Daniel.

Marie-Laure’s Scientific Life

After the war, the museum becomes the center of Marie-Laure’s professional life. She manages a small laboratory and contributes to the study of mollusks through a monograph on the folds of West African cancellate nutmeg shells and a frequently cited paper on sexual dimorphism in Caribbean volutes. She names two new subspecies of chitons. As a doctoral student, she travels to Bora Bora and Bimini, wades onto reefs, and collects snails on three continents. Her career extends the museum’s work of observation and classification, but her approach is not simply to accumulate specimens or move down a taxonomic hierarchy.

Marie-Laure is most drawn to living mollusks: snails moving over rocks, drawing calcium from water, and forming shells. She keeps six saltwater aquariums in her laboratory. Three cabinets salvaged from Dr. Geffard’s office stand along the back wall, each with four hundred drawers. The preserved specimens and the living tanks occupy the same workspace, but they represent different modes of attention: stored collections arrange knowledge in drawers, while the aquariums allow her to remain among the creatures themselves. Each autumn she teaches undergraduates, and her interest extends from scientific questions to the lives and experiences her students bring into the laboratory.

Marie-Laure continues to live in the flat where she grew up and walks to the museum. The institution is therefore not merely a workplace reached after the war; it is part of the durable pattern of her adult life. Its galleries, laboratories, cabinets, and aquariums link the novel’s wartime story of endangered collections with a quieter continuation of scientific practice. What the museum preserves is not only an inventory of objects, but also a setting in which attention can be renewed: from the uncertain identity of a diamond to the study of living shells.