The young woman held Mandy's arm tightly.
"Miss Charlotte, you must not run away like that again," she said.
"Excuse me," Mandy said, turning to look at the woman.
"I'm not Charlotte."
"Oh, you're not," the woman said, letting go.
She started to cry.
"Please don't cry," Mandy said kindly.
"Can I help you?"
The woman shook her head.
She wore a long black skirt and a black shawl over a long-sleeved blouse.
A bonnet was on her head.
"I'm Florence, Miss Charlotte's new nanny," she said.
"We came here to watch the royal foot guards."
"Look at that!" Vinnie interrupted them.
Soldiers in red jackets and bearskin hats marched in front of the building.
They were stepping very slowly, in perfect time with each other.
Another group of soldiers marched just as slowly toward them.
"It's the changing of the guards," Vinnie cried excitedly.
"We're back in England, Mandy, and this must be Buckingham Palace!"
"Quiet, Vinnie," whispered Mandy. "Florence is upset."
Florence looked at Vinnie strangely, but continued.
"Sometimes, Miss Charlotte likes to play tricks on me.
She saw the crowd and ran off.
I've been looking and looking . . . ," cried Florence.
She blew her nose into a handkerchief.
"She was wearing a pink dress like you."
The ceremony was over.
Now, new guards stood in front of the palace, and the old guards were marching away.
Florence wiped her eyes.
"I must not give up.
Miss Charlotte is probably close by."
"We'll help you find her," said Mandy.
"We will?" said Vinnie.
"By the way, I'm Mandy, and this is my brother Vinnie," said Mandy.
"Oh, thank you, Miss Mandy.
But where is your nanny?" asked Florence.
Mandy looked around.
She and Vinnie were dressed very nicely.
Some other children were dressed nicely too.
They all walked with young women dressed like Florence.
"We're just visiting," Mandy said quickly.
"Is your family new to London?" she asked.
The children looked at each other.
They remembered their earlier photo trip to London.
"It's only our second visit," Vinnie said truthfully.
"We don't live here."
"Well, I'm glad you're here," said Florence.
"I would appreciate your help, thank you."
The children followed Florence down the street.
"Where do you think Charlotte would go?" asked Mandy.
Florence thought for a moment.
"Miss Charlotte has always wanted to see the Crystal Palace," she said.
"That's where the Great Exhibition is."
"That sounds interesting," said Mandy.
"What kind of exhibition is it?"
Florence smiled at her.
"Let's start looking for Miss Charlotte there," she said.
"It's not far."
The children followed Florence, who headed quickly down the street.