"Where did you learn that there was a water dragon beneath Paris?" Severus asked Pomona in the sunlit library before they left.
France's newly built National Library had something strange about it: books that needed to be stored away from light were kept in a sun-filled high-rise like a glass box, while readers who needed light had to sit in underground reading rooms illuminated by artificial lamps.
"It was one of Newt's guesses. He found a parasite that only grows on water dragons in the eyes of a man named Kama," Pomona said. "But he was busy looking for Credence at the time, so he never investigated it."
"Kama? Yusuf Kama?" Severus asked.
"Who else could it have been?" Pomona curled her lip and took a sip of iced coffee.
Severus began to think.
"What are you thinking about?" Pomona asked.
"I'm thinking about how Kama became infected with that parasite." Severus spoke unhurriedly. "Corvus Lestrange was the last male heir of the Lestrange family. After his death, the French branch of the Lestrange family died out because its final male heir was gone. The Lestrange family did not recognize women's inheritance rights. After the French Revolution, many wizarding aristocrats became caught up in it. I heard that the final destination of those properties was underground pawnshops. That Kama had been searching for Young Corvus Lestrange all along, hadn't he? By 1927, there was no longer any need to enter Paris through smugglers' underground passages."
Severus took a sip of coffee and moistened his lips. "Books were not worth much and were easily disposed of as rubbish, especially the genealogies of families that had died out. Perhaps that place was like Gringotts and had dragons guarding it. Only Gringotts used fire dragons, while they used water dragons. Finding the useful