It was a quiet evening at Hershel Layton's house. He had invited both Emmy and Luke over to have dinner with him, and even stay the night. The request came out of nowhere and surprised Emmy and Luke.
That night, they sat eating what the Professor had prepared for them: some steak, potatoes, and salad. Luke grabbed his glass of milk and gulped down half of it. Once, he put it down, he spoke up.
"Professor," said Luke, "I got a puzzle for you."
"Lay it on me, then." responded Layton, with a smile.
"This one might seem familiar to you." said Luke.
-Puzzle 202: River Crossing-
You need to get one dog, two cats, and three baby chicks across a river. You can take only two animals at a time. If you leave the dog
with only one cat, there'll be a fight. If the chicks don't outnumber the cats, there'll also be afight. What's the fewest amount of
moves you can make, Professor?
"Seven crossings." said the professor.
"Exactly." said Luke.
When they were finished eating, he told Emmy and Luke that he was going to bed. This was odd to them. Normally he didn't go to bed at this time. Something was up.
"I think there's something wrong with professor." said Emmy.
"Maybe we're just thinking too hard on it, Emmy." responded Luke, "If anything is wrong, we'll find out in the morning."