“Sōsakan Sano Ichirō, reporting to His Excellency,” he told the guards stationed outside.

They bowed and opened the door without asking him to leave his swords or searching him for hidden weapons: He’d earned the shōgun’s trust. “You may proceed to the inner garden,” the chief guard said.

Sano walked down cypress-floored corridors past the government offices that occupied the building’s outer rooms. A sliding door, manned by more guards, led him outside again, where he followed a flagstone path through Tokugawa Tsunayoshi’s private garden. The pine trees’ densely fringed boughs hung still and heavy in the humid heat. Lilies filled the air with a cloying sweetness; bees buzzed lazily; dead maple leaves lay motionless on the pond’s glassy surface. Above the castle, a dark storm front bled across the gray sky like an ink wash on wet paper. Distant thunder rumbled. The oppressive atmosphere intensified the trapped sensation that Sano always felt in the castle. He prayed for the shōgun to assign him a new criminal investigation, not another ghost hunt or spying job. Then, as he neared the thatch-roofed pavilion, he stopped, disconcerted.

Chamberlain Yanagisawa Yoshiyasu—the shōgun’s second-in-command—occupied the center of the pavilion’s raised wooden floor. Dressed in a cool silk summer kimono patterned in blue and ivory, he knelt before a large sheet of white paper, his slim hand holding a brush poised over it. A servant waited beside him, ready to replenish the ink, refill the water bowl, or supply him with fresh paper from a thick stack. In two rows flanking Yanagisawa knelt the five men who comprised the Council of Elders, the shōgun’s closest advisers and Yanagisawa’s flunkies. More servants circled the pavilion, flapping fans to create an artificial breeze. But Tokugawa Tsunayoshi himself was nowhere in sight.

In a series of rapid, graceful curves and slashes, Yanagisawa swept his brush over the paper, writing a column of characters. “Sōsakan,” he murmured. “Won’t you join us.”

Sano climbed the steps onto the pavilion, knelt, bowed, and offered formal greetings to the assembly. “Honorable Chamberlain, I’ve come to report to the shōgun.” Apprehension tightened Sano’s chest: Yanagisawa’s presence during an audience with the shōgun boded ill for him.

Chamberlain Yanagisawa contemplated the verse he’d written. He frowned, shook his head, and motioned for the servant to remove the page. Then he looked up at Sano. Thirty-two years old, he’d been the shōgun’s lover since his youth. Tall and slender, with fine features and large, liquid eyes, he possessed an arresting masculine beauty at odds with his character.

“I’m afraid His Excellency is unavailable at the moment,” he said. “Whatever you have to say, you may say to me.”