In the far future, middle-aged scientist Leila Ghufran travels to a science station on Neptune to study its liquified diamond sea. Through a series of diary entries, Ghufran reveals that she has been diagnosed with Adamancy, a disorder in which the patient becomes obsessed with diamonds and refracted light, and experiences exceedingly cold temperatures. An entry on the symptoms and causes of Adamancy lists exposure to the material of Neptune’s diamantine seas, called Lucyite, as a cause of the disease. Over the course of several entries, lab reports, and news clippings, it is revealed that scientists discovered Lucyite, when melted, allows for teleportation through quantum entanglement. As a result, scientists, including Ghufran, began to study small shards of the hardened Lucyite to create closed-circuit teleportation devices for goods on Earth and teleportation to Neptune in a matter of seconds. 

In an entry, Ghufran’s colleague Hala, a fellow scientist, records an incident in which Ghufran examines the Lucyite and, out of obsession, eats the shards causing her mouth and hands to bleed. Parallel entries from scientists and executives from a company called Paragon Industries track Lucyite’s growing commodification into “Melee,” a teleportation device to increase the speed of trade on earth. Ghufran’s musings on her diamond obsession also track her descent into depression after being locked away from her research by Hala, and her growing hopelessness. Interspersed between these are article excerpts describing Lucyite activists’ calls to end Paragon Industries’ work-- they believe that Lucyite is a living organism deserving rights-- and Paragon’s attempts to quiet them. By the end of the saga, Ghufran fantasises about returning to the sea of diamonds on Neptune; she reveals that, having some Lucyite still in her system after swallowing it, she can heat it up with a nearby machine and teleport herself-- albeit painfully, and perhaps in a way that will kill her-- back to the lonely sea in the sky.