between the rocks and the tree roots.
âAmmy?â he called back. âYou coming?â
âYeah.â She sounded breathless.
Simon nailed his attention to the next two feet of path. Ikeâs head bobbed in the edge of his vision below. From above and behind came sounds of irregular breathing, thrashing cedar boughs, and steel on ice.
âHalfway down!â Ike called. Another couple of yards, and Simon started to relax.
Then Ammy yelled, and the yell swept closer. âIke!â Simon gasped. âWatch ââ
Something hit him behind the knees.
Ten seconds later, Ike picked himself up and nodded up at the cliff. âThere, weâre down. Not the way I planned,â he said, bending to pick up his hiking pole, âbut it wasnât so bad.â
Ammy struggled to her feet and rubbed her hip. She said nothing, which Simon thought was ominous.
âNext time you mention ski poles,â Simon said, unfolding himself from the ground, âIâm going to go home and lock the door.â
Ike uncased his digital camera and checked it over. âNo harm done. Ammy? You okay?â
âNo!â
âYou look okay. Letâs head on out.â
Travelling along the flat rocks at the base of the cliff was easier than climbing down, Simon found. You slithered and slid and fell down a lot, but at least you couldnât fall far.
The climb to the cave turned out to be the easiest part of the expedition. The cave mouth and the rocks below it were sheltered by the overhanging top of the cliff and almost completely free of ice. The rough layers of stone and the scrubby cedars, deeply rooted among the rocks, gave plenty of handholds and footholds.
Ike was the first to climb level with the rock apron in front of the cave mouth. âHey!â he yelled. âSomethingâs been here! Look at the evidence!â
A minute of breathless scrambling, and the three of them stood together on the ledge in front of the cave, all crowded against the cliff so as not to mess up the evidence. The entrance to the cave was about three feet high and wider than it was tall.
âFunny kind of tracks,â Simon said.
They were looking at a trail of scuffed footprints leading from the bare rock inside the cave and across the snowy ledge to the cliff, where it disappeared. One or two of the prints were clear. Somebody with long nails on his feet, Simon thought. His
bare
feet. An image flashed through Simonâs brain: a man with huge bare feet and toes with long talons, like a gigantic lizard. A chill ran down his spine. He stared at Ike, and Ike stared back at him.
Ammy, who had been very quiet, ducked down and peered inside the cave. Then she dropped to hands and knees and crawled in.
âDonât mess anything up!â Ike called after her.
âIke,â Simon said, âit snowed this morning. These tracks, whatever they are, canât have anything to do with last night.â
âI thought of that. They must be the second wave.â
âOf?â
âIntelligent dinosaurs, obviously.â Ike had his camera out and was taking pictures. âWhat else could have made those marks?â
Simon studied them. âSo youâre thinking...â
âUFO.â
âYouâre serious?â With Ike, it was sometimes hard to be sure.
âI wasnât at first.â Ikeâs freckles stood out sharply, the way they always did when he was scared. âI mean, I was, but not seriously. But now it all hangs together. Donât you think?â He clutched his camera. âThe blue flare with no known cause. Ammy with half her brain sucked out. That alien artifact she found.â
âWhat? Oh, that ring.â
âAnd now this.â Ike waved at the strange tracks. âIf a gigantic lizard didnât walk there, what did?â
They studied the tracks. âGrizzly,â Simon said, after a moment. âWe looked them up last winter for