Direction: The following passage consists of six sentences. The first and the sixth sentences are given. The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and choose the correct order from the options.

S1: The Hound of Baskervilles was feared by the people of the area.

P: Some people spoke of seeing a huge, shadowy from a Hound at midnight on the moor.

Q: But they spoke of it in tones of horror.

R: Nobody had actually seen the hound.

S: This shadowy form did not reveal any details about the animal.

S6: The Hound of Baskervilles remains an unsolved mystery.