Bilbo Baggins, it should be noted, was a bitter old hunchback who had long ago ordered one of the gardens to be locked off, because his beloved Lobelia had adored it and then died and left him alone. But Rosie was a curious child, and wanted to find the key to this secret garden.
Luckily enough, Sam owned a metal detector and they were soon in business.
Then, one night, when Rosie was lying in bed - exhausted from a day of digging and planting with Sam, nudge nudge wink wink - and heard someone whining. She followed the sound until she found a small, sickly, grouchy hobbit in one of the many big dark rooms of the big dark smial.
"My name's Frodo," he said. "Are you a ghost?"
~