Three days later, the Gu family was finally ready to depart for their manor when Eunuch Qian arrived unexpectedly.
"Lord Gu," the eunuch announced, "the Emperor summons you to the palace immediately."
Gu Chengrui apologized to Zhou Ying and approached Eunuch Qian. "May I inquire about the reason for the Emperor's summons?"
He discreetly slipped Eunuch Qian a five-tael silver ingot.
"Do you recall," Eunuch Qian explained after pocketing the silver, "that the Emperor sent expeditions last year to search for mineral deposits? Many shipments have arrived since the New Year. His Majesty requests your assistance in identifying them, particularly any rare minerals you might be seeking."
"Of course, I remember," Gu Chengrui replied. "However, I'll need to return home to obtain some verification tools and reagents."
"Please hurry back," Eunuch Qian urged. "I'll wait here."