“Plus I’m not sure we gave ourselves away,” Theo said. “We were researching it online, but did we say anything out loud?”

Tess went over their conversation in her head. “I don’t think so. Not exactly.”

“But those bugs didn’t only have ears, they had eyes,” said Jaime. “Maybe one of them saw the screen.”

“So we have to get to the next clue first. And then we have to make sure that no one is on our trail, and there’s nothing left of the clue for anyone else to figure out,” Tess said.

“You mean, destroy it?” Jaime said. “What if it’s valuable?”

A squirrel hopped in front of them, begging for handouts. Jaime eyed it with suspicion, as if it were a spy, too. He tore off a bit of pretzel and threw it. The squirrel ran after it.

“None of the clues have been especially valuable,” Theo said. Ono beeped in protest. “Except for Ono.”

“Before we talk about destroying anything, let’s figure out where we’re going.” Jaime pulled his phone from his pocket, then stared at it. “What if the phone is bugged?”

“If it was,” said Tess, “we would have been in Slant’s dungeon a long time ago.”

“You think Slant actually has a dungeon?” Theo asked.

“Oh, he definitely has a dungeon,” said Jaime. “Back to the clue written on the wall of the haunted hospital. ‘Bury me right next to Louis MG.’ I saved the search we did before Cricket and her mom came over. We were trying to find out who Louis MG was, and we found that article about the most famous residents of New York City’s cemeteries. I’m betting this Louis guy is probably buried in one of them.”

“There are a lot of cemeteries in New York City,” Theo said, as if that wasn’t obvious.

“So we might have to visit a lot of graves,” Tess said.

“Cool,” said Theo.

“Or at least a lot of cemetery websites,” Jaime said.

Theo scrunched up his nose. “Meh.”

They searched Trinity Cemetery, Woodlawn Cemetery, and Calvary Cemetery. Then they got more pretzels and few hot dogs. After they ate their lunch, they fed the relentless squirrel and searched the database of Green-Wood Cemetery. And that was where they found a list of famous Louises buried there, including one Louis Moreau Gottschalk.

“Louis MG,” said Jaime, skimming the article he’d found. “Lot 19581 in the cemetery. An international musical star, brilliant pianist, and the first important American composer, born in New Orleans to a German-Jewish father and a Creole mother. His music melded all kinds of sounds, including Creole, black, mariachi, Cuban, all sorts of things. Plus he was a committed abolitionist. Seems like my kind of guy.”

“And the Morningstarrs’,” said Tess.

“Or the Cipher’s,” Jaime said.

“Green-Wood Cemetery,” said Theo. “So we have to go back to Brooklyn.”