“Were you like this all the way from Italy?” Cat asked him, slightly awed.

“Rather worse,” Tonino said through the handkerchief, and swallowed desperately.

Cat knew he should sympathise. He got travel-sick himself, but only in cars. But instead of feeling sorry for Tonino, he did not know whether to feel superior or annoyed that Tonino, once again, was more to be pitied than he was.

At least it meant that Cat did not have to talk to him.

Dulwich was a pleasant village a little south of London and, once the train had chuffed away from the platform, full of fresh air swaying the trees. Tonino breathed the air deeply and began to get his colour back.

“Bad traveller, is he?” Mordecai Roberts asked sympathetically as he led them to the cab waiting for them outside the station.

This Mr Mordecai Roberts always puzzled Cat slightly. With his light, almost white, curly hair and his dark coffee complexion, he looked a great deal more foreign than Tonino did, and yet when he spoke it was in perfect, unforeign English. It was educated English, too, which was another puzzle, because Cat had always vaguely supposed that Mr Roberts was a sort of valet hired to look after Gabriel de Witt in his retirement. But Mr Roberts also seemed to be a strong magic user. He looked at Cat rather reproachfully as they got into the cab and said, “There are hundreds of spells against travel sickness, you know.”

“I think I did stop him being sick,” Cat said uncomfortably. Here was his old problem again, of not being sure when he was using magic and when he was not. But what really made Cat uncomfortable was the knowledge that if he had used magic on Tonino, it was not for Tonino’s sake. Cat hated seeing people be sick. Here he was doing a good thing for a bad selfish reason again. At this rate he was, quite definitely, going to end up as an evil enchanter.

Gabriel de Witt lived in a spacious, comfortable modern house with wide windows and a metal rail along the roof in the latest style. It was set among trees in a new road that gave the house a view of the countryside beyond.

Miss Rosalie threw open its clean white front door and welcomed them all inside. She was a funny little woman with a lot of grey in her black hair, who always, invariably, wore grey lace mittens. She was another puzzle. There was a big gold wedding-ring lurking under the grey lace of her left-hand mitten, which Cat thought might mean she was married to Mr Roberts, but she always had to be called Miss Rosalie. For another thing, she behaved as if she was a witch. But she wasn’t. As she shut the front door, she made brisk gestures as if she were setting wards of safety on it. But it was Mr Roberts who really set the wards.

“You’ll have to go upstairs, boys,” Miss Rosalie said. “I kept him in bed today. He was fretting himself ill about meeting young Antonio. So excited about the new magic. Up this way.”