The McCanahan was warming to his subject. "We fought the sfarri across a score of galaxies, ever since my grandfather Rhoderick—bless his memory!—first crossed atomic disintegration beams with their cruisers. They've pushed us back, away from the Rim planets. Everywhere our paths have met, there's been bloody war. Bloody? Ha! There's been no blood spilled on their side. Just cogs and wheels and wire!"

Flaith tossed back a lock of reddish gold hair from before her eyes. "You killed them in Clonn Fell. You slew them when you touched your harp strings! The sound did it."

"The harp of Brith Tsinan. Aie! It had the silver string that I took from my father's wrist attached to it. Do you remember how I broke the other, when I threw the harp on the road from Akkalan? Where is the harp, Flaith?"

The old peddler came shuffling forward from the doorway, dropping his shoulder to loosen the strap that held the black sack to his back. From the sack the bright silver harp tumbled into the McCanahan's eager fingers.

He lifted the harp and set it to his shoulder. His hands played across the strings, and the wild sharp peal of the strings swept up and through the tower.

In answer to the high, keening notes, a tube in the great metal machine spanged shrilly. The tinkle of broken glass was loud in the sudden silence as Kael dropped his fingers from the quivering harp strings.

Lunol, the peddler, cried out harshly, his face a wet mass of sweating fear. Flaith screamed high and shrill. Her bare arm lifted and pointed.

The McCanahan whirled, and his harp fell from numb fingers.

Bright and blazing, like the core of a giant sun, a whirling mass of fiery matter whirled and quivered, pulsing before the great machine. Its incandescence was blinding, brilliant. They could read the fury in the flame of its sentient heart. They needed no voice to tell them.

Noorlythin!