“There are twenty-four of them,” she said. “Rather boisterous. You know what boys are like.”

“We do,” said Zach, dolefully.

“No problem,” I said. “If the children go into the garden for a few minutes, we can set up in the living room.” I walked into the living room and clapped my hands. “Kids, run outside now. We’ll call you when the show is about to begin.”

There was a stampede through the French windows. Mrs. Wyndham ran after them, wailing something about her camellia.

Zach and I had made the puppet theater together. We had sawed and nailed. On a canvas sheet we had painted blue mountains, a green forest, the inside of a cottage. We had even made one of our puppets, a lion, out of papier-mâché. It was messy, took ages, and looks like a lump of dried plasticine with a wonky face painted on its knobbly, asymmetrical surface. We bought the rest from a specialist shop. We have a couple of short plays, which Zach wrote. After all, he’s the writer. That’s what he says he does when anyone asks him. “I write novels,” he says firmly, maybe adding as an afterthought that he subsidizes his writing with other things, like being a children’s entertainer.

His puppet shows are short and complicated and involve too many different voices. Today’s had a boy, a girl, a wizard, a bird, a butterfly, a clown, a fox. I always feel very sweaty afterward.

Zach already knew about the letter, of course, and the police, and all of the precautions they were taking. He’d met Lynne today, for we had given him a lift to Primrose Hill, and he’d sat in the front beside her and talked to her about chaos theory and how the population of India was about to pass one billion while she maneuvered through the traffic, looking dazed.

As we were slotting together the theater, he asked me if I was at all scared by the business.

“No.” I hesitated as I hooked the curtains across the miniature stage. But I had to tell someone. “More excited, as a matter of fact.”

“That sounds a bit perverse.”

“The thing is, Zach, can you keep a secret?” I didn’t wait for him to reply. I knew he couldn’t. He’s famous for being like a sieve. “I’m having a thing with one of the policemen.”

“What?”

“I know. It’s a bit weird, but-”

“Nadia.” He took hold of my shoulders so I had to stop what I was doing. “Are you insane? You can’t do this.”

“Can’t?”

Zach gestured wildly, as if he couldn’t show by words alone how badly I was behaving.

“It’s not on. It’s wrong. It’s like having an affair with your doctor. He’s taking advantage of you, of your vulnerability. Can’t you see? Look, I’m sure that you see it as something beautiful and pure and important, but you’ve just split up with Max and you’re jumping into bed with someone who’s supposed to be protecting you.”

“Shut up, Zach.”

“Father figure. You have to stop it, Nadia.”

“He’s married,” I added miserably. Just saying it made my chest hurt.

Zach gave a sarcastic snort. “But of course.”

“He’s very attractive. I mean I’d never have thought…” I shivered as I remembered that morning, just a few hours ago, when he’d taken over from Lynne for an hour, and we’d made love in the bathroom, up against the tiled wall, fumbling at each other’s clothing, desperate.

“Nadia,” Zach said urgently. “Oh fuck, here they come.”

The boys had returned from the garden.

After the show, I got Oliver to help me do my pathetic magic trick, and the wand collapsed every time he touched it, and all the children shouted “Abracadabra!” as loudly as they could, and Mrs. Wyndham winced in the doorway. Then I asked them to give me strange objects that I could juggle with. One vile child, called Carver, presented me with a cheese grater he had found in the kitchen, but I didn’t think Mrs. W wanted blood on the carpet. I chose a melon, a napkin ring, and a drumstick, and I didn’t drop any of them. Zach blew up long balloons and twisted them into animal shapes. Then the children bolted into the kitchen for sausages on sticks and jam-filled biscuits and a birthday cake in the shape of a train. And it was over. Zach was desperate for his cigarette, so I pushed him outside.

“Do you mind?” he asked. “Clearing up the stuff?”

“No, go on, scarper.”

“Remember what I said, Nadia.”

“Sure, sure. Now push off, partner.”

“You’re not going to stop, are you?”

I shut my eyes for a moment, felt in my imagination his mouth against my throat.

“I don’t know. I can’t say.”

Parents and nannies started arriving-I can tell the difference between the two a mile off. I dismantled the theater and started to stack it into its box. A pretty young woman came up to me with a cup of tea.

“Mrs. Wyndham asked me to bring you this.” She had silver-blond hair and a funny, lilting accent.

I took it gratefully.

“Are you Oliver’s nanny?”

“No. I came to collect Chris. He lives just down the road.” She picked up a puppet and examined it, put it on her hand. “It must be hard, your job.”

“Not as hard as yours. Do you have just the one?”

“There are two older ones, but Josh and Harry are at school. Does this go in the bag?”

“Thanks.” I gulped at the tea and started loading up. I had this down to an art. She stayed, looking at me. “Where do you come from? Your English is fantastic.”

“Sweden. I was meant to go home but there was a bit of fuss.”

“Oh,” I said vaguely. Where was that wand? I bet Oliver had wandered off with it and worked out how to bend it into segments. “Well, thanks, er…”

“Lena.”

“Lena.”

She disappeared back into the kitchen, where the other nannies were gathered round their charges, watching them stuff chocolate pieces of train into their mouths and talking about boyfriends and nightlife. Children started leaving. “Say thank you,” I heard, and “Where’s my party bag?” and “Harvey’s got a blue one-I want a blue one too.”

I picked up all my stuff. Thank God Lynne was out there with her car. There were some advantages to being followed around by a blushing, stubborn policewoman. A small fair-haired boy bumped into me in the hall. He had violet smudges under his eyes and a chocolate smear round his mouth.

“Hi,” I said brightly, determined to make a quick exit.

“My mummy’s dead,” he said, fixing me with his bright gaze.

“Oh well,” I said, looking around. The mother was probably in the kitchen somewhere.

“Yup. Mummy died. Daddy says she’s gone to heaven.”

“Really?” I said.

“No,” he said, taking a suck of his lolly. “I don’t think she’s gone that far.”

“Well…” I said.

“A man killed her dead.”

“That can’t be true.”

“In true life,” he insisted.

Lena returned, carrying his jacket. “Come on, Chris, home,” she said.

He took her hand.

“I want my party bag first.”

“He says his mother was killed,” I said.

“Yes,” she said simply.

“What? Really?”

I put down the box and bent down to Chris again. “I’m very sorry,” I said again, ineptly. I couldn’t think what to say.

“Can I have my party bag now?” He tugged on Lena’s hand impatiently.

“When did this happen?” I asked Lena.

“Two weeks,” she said. “It’s a terrible thing.”

“Christ.” I looked at her with fascination. I’d never been near someone who’d been near someone who was murdered. “What happened?”

“Nobody knows.” She shook her head from side to side so her silver hair swung. “It happened in the home.”

I gawked at her.

“How terrible. How terrible for everyone.”

Mrs. Wyndham came up with a party bag for Chris. It looked three times as big as everyone else’s.

“There you are, darling,” she said, and planted a kiss on the top of his head. “If there’s anything I can do…” She sighed, as if it hurt her just to look at him. “Little lamb.” She glanced round at me. “I’ll get you your money, Miss Blake. I won’t be a minute-it’s all ready.”