"What was Ada doing on the boating lake?" asked Harold as he twisted the van around Poet's Corner and felt the offside wheels leave contact with the ground. "Besides rowing a boat, I mean."
"Patently not rowing a boat, obviously," said Jasfoup, "seeing as she called us because she'd dropped them in the water."
"But why was she on the lake at all, several hours after the park had closed?"
Jasfoup coughed. "She was feeding the giant squid," he said. "She asked me not to tell you, but since you're going to find out anyway..."
"Giant squid? What giant squid?" Harold was staring at the demon so hard he ran over Mrs. Peterson, but didn't worry about it since she'd died when he was twelve and had spent thirty years crossing Baker Street at this time of night.
"It's the one from the lake at Hogwarts," said Jasfoup, sadly. "It was made redundant when they finished making the ninth film."
part one here: Laverstone Tales: Nautical Terms