This musical information, though unexpected, only put me more on my guard.
"No doubt the perpetrator of this musical joke has left the room with the instrument by now, so let's enjoy this good meal. Afterward we will go up to the empty bedroom and investigate. Perhaps she, he or it has left some clues for us to ponder..."
"Oh, Constable Crab--I am SO glad you are here!" Angelica said. "This is the kind of strange occurrence that has got me absolutely unstrung!"
"Don't worry, Angelica. A little harp music never hurt anyone! Very tasty, these jam tarts!"