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〃I didn't want things to end up like this；〃 she said； more calmly。 〃But you've made it clear it's either you or me。 And I'm the one holding the gun。〃
Nora said nothing。
〃So turn around； Nora。 Walk to the edge of the roof。〃
Sloane's voice had grown very quiet。 Nora stared at her。 In the pale light； the amber eyes were hard and dry。
Her gazed still locked on Sloane； Nora took a step backward。
〃There's only one bullet left in the chamber。 But that's all I'll need； if it es down to that。 So turn around； Nora。 Please。〃
Slowly； Nora turned around to face the night。
Open space stretched out before her； a vast river of darkness。 Across the narrow valley； Nora could make out the dark violet of the far wall of cliffs。 She knew she should feel fear； regret； despair。 And yet the only emotion she was aware of was a cold rage： rage at Sloane； for her pathetic； misplaced ambition。 One bullet 。 。 。 she wondered； if she threw herself to one side； whether she stood a chance in hell of dodging that bullet。 She tensed； readying herself for sudden movement。
Sloane shifted behind her。 〃Step off the roof；〃 she said。
But still Nora stood； eyes and ears open to the night。 The storm had passed。 She could hear the frogs calling from below； the hum and drone of insects going about their nocturnal business。 In the intense stillness； she could even hear the blood as it rushed through her veins。
〃I'd rather not shoot you；〃 she heard Sloane say。 〃But if I have to； I will。〃
〃Damn you；〃 Nora whispered。 〃Damn you for wrecking the expedition。 And god damn you for killing Bill Smithback。〃
〃Smithback？〃 The tone in Sloane's voice was one of such surprise that； despite herself； Nora turned toward it。 As she did； she saw a form suddenly emerge from the hole in the roof： a dark； matted shape； wolf pelt twisting around naked painted skin。 Pale light glistened off a crimson patch of fur that stained the figure's midriff。
Sloane pivoted as the thing rushed at her with a great howl of vengeance。 There was a flash of moonlight on the gun； the arc of a knife； and both figures went down； rolling frantically in the loose dirt of the tower roof。 Nora dropped to her knees and crawled crablike away from the edge； eyes riveted to the struggle。 In the moonlight； she could see the figure； burying the black knife again and again into Sloane's chest and stomach。 Sloane cried out； twisting and thrashing her body。 With a supreme effort； she tried to pull herself away。 She half rose； gun hand swiveling around desperately； only to be pulled down again。 There was a terrible thrashing； another anguished cry from Sloane。 The blade flashed down and the gun fired at last； blowing the knife into hundreds of glittering slivers of obsidian。 With a howl； the dark shape flung itself upon her。 There was a final thrash； a puff of dust： and then both figures were gone。
Nora rushed quickly to the edge； peering down in horror as the bodies； locked together； landed in the sand at the bottom of the tower； flew apart； then rolled off the edge of the city。 Before the moon buried itself once again behind the clouds； it winked briefly off Sloane's pistol as it spun lazily； end over end； into the unfathomable night。
Trembling； Nora pulled herself back； sprawled across the floor； breathing hard。
They had not killed the skinwalker； after all。 It had hidden itself somewhere within the blackness of the tower； waiting for the right moment in which to strike。 Then； it had attacked Sloane with a single…mindedness so furious Nora could barely prehend it。 And now； that skinwalker was dead。 And so was Sloane。
But it was not the chase up the tower； or even the encounter on the roof； that filled her with absolute terror。 In the desperate struggle； one crucial fact had slipped her mind。 Two figures in wolfskins had assaulted her in the ranch house； on that clear Santa Fe night； barely three weeks before。 And that meant only one thing。
There was another skinwalker； loose somewhere； in the valley of Quivira。
66
HER BREATH ING IN GASPS； NORA moved toward the hole in the tower roof。 She lowered herself； as quietly as she could； into the small redoubt below。 On hands and knees； she crawled toward the lip of the chamber； then looked slowly over the edge。 It was pitch black in the tower； she sensed； rather than felt； the vast emptiness below her。 She heard nothing save for the rush of water in the valley beyond…the maddening； unceasing babble that disguised other； stealthier； sounds。
Her arms trembled； the thought of descending； sightless； through the plex labyrinth of ancient wood was terrifying。 Yet even more terrifying was the thought of remaining here； inside the tower； waiting for something to e for her。 Now that she had no weapon…now that there was no possible way to defend herself…the tower had bee a deathtrap from which she had to escape。
She struggled to regulate her breathing。 Extending one foot over the ledge； she swept it gingerly from side to side until she found the first notch of the topmost ladder。 Moving carefully forward； she eased her weight onto the old framework； keeping one hand on the shelf until she knew she had a firm foothold。 Then； with extreme caution； she began to descend； one notch at a time。 She could feel a chill wind rising up from below； caressing her legs。 The wind rose； and the tower creaked and ticked in response。 Pebbles came clattering past her； their echoing fall reminding her of the abyss below。
At last her foot reached the firmness of the second shelf。 She paused for a second； trying once again to steady the wild rise and fall of her chest。 But she could not remain here： poised between roof and floor； she was even more vulnerable。 Groping in the darkness； fingers extended； she reached for the top of the detached second ladder。 Once again； she began the descent； limbs balanced between the creaking wooden pole and the stone protrusions。
Just as she was about to reach for the next shelf； she froze。 There had been a sound； she thought： the soft hollow sound of a footfall。 She waited； listening； in the darkness。 But there was nothing more； and with relief she slid down onto the safety of the shelf。
One more ladder。 Steadying herself； she reached for it； tested it。 Then； as carefully as before； she descended first one notch； then another； and then another。
Suddenly； she felt the pole give with a dry crack。 The entire wooden structure seemed to shudder around her。 Immediately； she pushed herself away from the pole and dropped the last ten feet； hitting the stone floor with a mighty impact。 Needles of pain lanced through her knees and ankles as she scrambled to her feet and stumbled through the low doorway onto the adjacent rooftop。 She glanced around； shaking with exertion and fear。 But there was nothing： the city seemed perfectly silent and deserted。
She had to get to the valley。 At least there； she might have a chance。 Perhaps Sloane had been wrong。 Perhaps Swire and Bonarotti were still alive。 If she could hide until daylight； she'd have a better chance of finding them。 There was safety in numbers。 She might even be able to locate Sloane's gun； lying somewhere in the darkness of the valley floor。 And there was always the hope； remote as it was； that Smithback's gunshot wound was not fatal 。 。 。
Nora brushed her hand across her face with a sob。 She could not allow herself to think about that； not now。
Keeping as low as possible； she crept across the roof and peered down the ladder that leaned against it。 The way below seemed clear。 Swinging herself over the edge； she descended as quickly as she dared； then paused to look around。 Nothing。
She paused once again。 The city seemed silent and asleep。 The moon； alternately emerging from and disappearing behind the racing clouds； painted uncertain fingers of light across the roomblocks。 And yet her instincts told her that something was wrong。
Cautiously； keeping against the wall of the tower； she moved around toward the front of the city and peeked around the corner。 One at a time； objects came into view； lit by the fitful glow of the moon： the retaining wall； the central plaza； the ghostly outline of roomblocks。
Once aga