'It was a sensible precaution. After your - your party, it was days before we figured out how to get rid of the damn thing. It was your robot who came up with the answer.'

'You couldn't put it on a ship because it would eat its way through the floor... Isaac? What did he suggest?'

They watched through the hole. On the lawn outside Samhedi's equipment was clustered around the baby black hole. The silvery sheen had disappeared now. It appeared as a point in space that wrenched at the optic nerves, and the men working around it had to hang on against the wind that was driving into nowhere.

Three of them manhandled a tall cylinder until it was standing upright under the thing. The cylinder was thick with matrix coils.

'This should be quite impressive,' said Joan.

'I'm getting the idea, I think,' said Dom. 'The bottom of the tube is sealed, the matrix field stops it touching the edges, the air rushes in at the top...'

Samhedi bellowed an order against the gale. The thing - it looked like an eye now, a malevolent one staring straight at Dom - dipped into the cylinder.

There was an explosion.

It was the cylinder, reaching Mach One a mile overhead. It sucked itself on towards the stars.

'Neat,' said Dom. 'Suppose it hits the sun? No, you'd have a ship up there. Then what?'

'Seal it up and dump it in deep space. Isaac suggested finding a genuine black hole and dumping it there. That sounds like an invitation to blow up the universe, though, so Hrsh-Hgn suggested accelerating it to about half as light as it was. It'd accelerate, he believes, on interstellar hydrogen.'

'And end up drilling a hole in someone's planet on the other side of creation,' said Dom. He was trying to smile.

His grandmother reached out and took his shoulder.

'You're not doing badly at all, Dom.'

'You neither, grandmother.'