Fireheart's fur bristled with disbelief and fury as he gazed up at the new leader of ShadowClan standing on the Great Rock. He watched as the cat swung his massive head from side to side. Muscles rippled under his gleaming pelt and his amber eyes seemed to glow with triumph.

"Tigerclaw!" Fireheart spat. His old enemy -- the cat who had tried to kill him more than once -- was now one of the most powerful cats in the forest.

The full moon rode high above Fourtrees, shedding its cold light over the cats of the four Clans, assembled there for the Gathering. They had all been shocked to learn of the death of Nightstar, the ShadowClan leader. But no cat in the forest had expected that ShadowClan's new leader would be Tigerclaw, the former ThunderClan deputy.

Beside Fireheart, Darkstripe was rigid with excitement, his eyes glittering. Fireheart wondered what thoughts were going through the mind of his black-pelted Clan mate. When Tigerclaw had been banished from ThunderClan, he had invited his old friend to go with him, but Darkstripe had refused. Was he regretting that decision now?

Fireheart caught sight of Sandstorm weaving her way toward him. "What's going on?" the pale ginger she-cat hissed as she came into earshot. "Tigerclaw can't lead ShadowClan. He's a traitor!"

For several heartbeats, Fireheart hesitated. Shortly after he had joined ThunderClan, Fireheart had discovered that Tigerclaw had murdered Redtail, the deputy. Once Tigerclaw became deputy himself, he had led rogue cats to attack the ThunderClan camp, trying to murder their leader, Bluestar, so that he could take her place. As punishment, he had been banished from their Clan and the forest. It was hardly a noble history for a leader of any Clan.

"But ShadowClan don't know about all that," Fireheart reminded Sandstorm now, keeping his voice low. "None of the other Clans know."

"Then you should tell them!"

Fireheart glanced up at Tallstar and Crookedstar, the leaders of WindClan and RiverClan, respectively, who stood beside Tigerstar on the Great Rock. Would they listen if he told them what he knew? ShadowClan had suffered so much from Brokentail's bloodthirsty leadership, followed by a devastating sickness, that they probably wouldn't care what their new leader had done, as long as he could forge them into a strong Clan again.

Besides, Fireheart couldn't help feeling a guilty relief that Tigerclaw had satisfied his hunger for power in a different Clan. Maybe now ThunderClan could stop waiting for him to attack, and Fireheart could walk the forest without constantly glancing over his shoulder.

Yet, as he struggled with his conflicting emotions, he knew that he would never forgive himself if he let Tigerclaw come to power without even making a protest.

"Fireheart!" He turned to see Cloudpaw, his long-furred white apprentice, padding quickly toward him with the wiry brown warrior Mousefur just behind. "Fireheart, are you just going to stand there and let that piece of fox dung take over?"

"Quiet, Cloudpaw," Fireheart ordered. "I know. I'll -- "

He broke off as Tigerclaw paced to the front of the Great Rock.

"I am pleased to be here with you at the Gathering this night." The huge tabby spoke with quiet authority. "I stand here before you as the new leader of ShadowClan. Nightstar died of the sickness that took so many of my Clan, and StarClan have named me as his successor."

Tallstar, the black-and-white leader of WindClan, turned to him. "Welcome, Tigerstar," he meowed, nodding respectfully. "May StarClan walk with you."

Crookedstar meowed agreement as the new ShadowClan leader dipped his head in acknowledgment.

"I thank you for your greetings," Tigerstar replied. "It's an honor to...