A fierce windstorm swept the hills outside Edo. Lightning seared bright white veins down the gray sky while distant thunder reverberated. A Shinto priest hurried along a path through the forest. He clutched his black cap to his head and staggered as the wind buffeted him. His white robe flapped like a swan in mad flight. Dirt and leaves swirled around him in cyclones that stung his face, blinded him. He stumbled faster uphill toward the shrine, where he could take shelter.

The trees swayed, creaked, and thrashed. The wind’s howling force knocked the priest to the ground. As he struggled to regain his feet, he heard an ominous cracking noise, as if the world were splitting. He saw a huge, dead oak tree pitch toward him. Crooked, leafless branches reached down like monstrous hands to grab him as the tree toppled, its massive trunk a black battering ram aimed to kill. The priest flung his arms over his head and screamed.

The tree crashed with a thud that shook the world. Branches scraped the priest, enmeshed him. He was stunned but miraculously alive. The wind’s fury ebbed. Untangling himself from the branches, he saw that the heavy tree trunk lay close beside him. The gods had spared his life.

Dazed, the priest climbed the hill, gawking at the fallen corpse of the tree. The roots had torn loose from the dirt. They’d left a yawning hole in the forest beside the path. Something in the lumpy earth just below the surface level at the edge of the hole caught the priest’s attention.

The object was brown from the soil, with a rounded top the size of a small melon. The priest squatted for a closer inspection and recoiled in dismay. Empty eye sockets stared and bare teeth grinned up at him. It was a human skull.

Lady Reiko rarely left home, and never without an army for protection.

In the past few months, the strife between her husband, Chamberlain Sano, and his rival, Lord Matsudaira, had escalated drastically. Their troops brawled in the streets of Edo, eager for war. No one was safe; anyone could be caught in the violence.

Riding in a palanquin through the city, Reiko peered through the window shutters. Her mounted guards blocked her view of the high walls and roofed gates of the mansions in the official district. All she could see were armored legs astride moving horse flanks. Her bearers marched in time with the steps of the foot soldiers in her entourage, which numbered fifty armed men in all. Reiko leaned back on the cushions and sighed.

Not a glimpse of the city’s color and bustle or breath of spring air could reach her. Yet these precautions were vital. Last winter, Lord Matsudaira had served notice that Sano’s family wasn’t off-limits in the power struggle. He’d had Sano and Reiko’s then-eight-year-old son, Masahiro, kidnapped and sent to the far north. Knowing that she might be the next target, Reiko left Sano’s estate inside Edo Castle only on the most serious business.

Her aunt had died, and although they hadn’t been close, the woman had been kind to Reiko during her childhood. That fact, plus family duty, had obligated Reiko to brave venturing outside to attend the funeral. Now her procession suddenly slowed. Guards at the front ordered, “Get out of the way!”

She risked opening the shutters a crack and saw two oxen yoked to a cart filled with lumber blocking an intersection. Such carts, owned by the government, were the only wheeled vehicles permitted in Japan. Forcing everyone to travel by horse or by foot prevented troop movements and insurrection-at least in theory. Soldiers behind her called to the others, “Keep going, don’t stop!” The front guards yelled, “Move it now, or die!”

A jarring thud hit the top of the palanquin. Reiko gasped as her bearers wobbled under the extra weight. One of them shouted, “There’s a man on the roof!”

The man must have jumped off the wall. While her guards shouted and jostled around her palanquin, she felt another thud as another man landed.

“Ambush!” shouted the guards.

The doors of the palanquin burst open. Reiko screamed. Her attackers-two young samurai with knives gripped in their teeth-swung upside down from the roof at her. As she drew the dagger she wore in a sheath strapped to her arm under her sleeve, they flipped into the palanquin, transferring their knives from teeth to hands.

“Help!” Reiko shrank into the corner and lashed her dagger at her attackers.

Her blade cut their arms. They seemed not to care. Blind savagery glazed their eyes as they slashed at her. Their hot breath and pungent sweat filled the palanquin. Reiko saw the crests stamped on their kimonos. They were Lord Matsudaira’s men, no surprise. She frantically parried against their blades. One grazed her face. Outside, swords clashed while her guards fought off more Matsudaira troops who’d joined the attack. The combatants’ bodies thumped against the palanquin. Horses whinnied as the battle raged.

“Turn around!” her guard captain shouted. “Head back to the castle! Somebody get those bastards off Lady Reiko!”

Reiko heard her chief bodyguard, Lieutenant Asukai, call her name. As her attackers pinned her arms and she kicked at them, he lunged into the palanquin and seized one of the men. The palanquin veered in a jerky about-face. The bearers broke into a run.

Lieutenant Asukai dragged the man outside. They tumbled into the street under the horses’ skittering hooves and the feet of the battling soldiers. The attacker still inside threw himself on top of Reiko. He clutched the wrist of her hand that held the dagger. His weight immobilized her. She desperately thrashed and writhed, beating at him with her free left hand. His blade strained toward her throat. Reiko could see her terrified face reflected in the shiny steel.

“Hold on, Lady Reiko, I’m coming!” Lieutenant Asukai shouted.

He grabbed her attacker’s legs. Reiko struck at the man’s face and sank her fingernails into his eyes. He screamed, let go of her, and reared up. Lieutenant Asukai yanked at his legs until he flew backward out of the palanquin, bleeding from the eyes, knife raised, mouth yowling.

Reiko saw the portals of Edo Castle ahead, promising sanctuary. The castle was neutral territory in the conflict between Sano and Lord Matsudaira, by tacit, mutual agreement. They both lived inside it; neither wanted war on his own doorstep. The sentries stared in amazement at Reiko’s palanquin hurtling toward them and the battle that trailed it like unruly streamers.

“Let us in!” Lieutenant Asukai shouted, running beside Reiko.

The sentries swung open the huge, iron-banded gate. Winded and puffing, the bearers staggered carrying the palanquin through it. The gate slammed shut. Reiko sighed in relief.

“That was too close a call,” Sano said.

He crouched on the floor beside Reiko, in their private chamber, watching grimly as the doctor dabbed medicinal ointment on the cut on her cheek. First his son kidnapped, now his wife ambushed. Lord Matsudaira had gone too far. Sano tasted fury as raw as blood.

Reiko managed a brave smile. “It’s just a scratch. I’m fine, really.” The doctor finished, gathered up his medicine chest, and departed. Reiko spoke to Masahiro, who knelt near her. “I don’t look half as bad as you do.”

Masahiro, nine years old, had come running when he’d heard about the attack. His white martial arts practice uniform was dirty from wrestling on the ground; he sported cuts and scrapes on his hands, arms, and knees. A fading purple bruise surrounded his left eye. Ever since his abduction, Masahiro had pursued his martial arts studies with punishing vigor, the better to defend himself. This was no longer just a game he was good at, but a matter of life and death.