The strange rainbow.
"Ladies." The Librarian says by way of greeting, "Thank you for coming so promptly."
He indicates a couple of chairs already set in front of his desk. There is a round backed carver style chair, similar to his own, for Lilianne and a higher chair, with a base that will help a smaller person step up onto the seat, ready for Esmeralda. "I have a report of an unusual effect in the Pear Orchard at the far end of the North Wing. Apparently there is a some sort of rainbow effect on one of the hedges, and I would like to know more about it, as it is not something that we would expect to find there. Both The Agent and I are excepting visitors, or else we would stroll down and have a look for ourselves, So I thought you two might be able to have a look for us. We will, of course, be suitably grateful at the conclusion of your investigation."
"Tea?" he asks, pouring himself a cup from the pot on the table.