In each question, the first and the last sentences of the passage are numbered S1 and S6 respectively. The rest of the passage is split into four parts. These four sentences are jumbled. Read the sentences and identify their correct and logical order.

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S1: It was early 1943 and the war in the East was going disastrously.
P: How this unlikely bunch of middle aged civilians accomplished their missions makes fascinating reading.
Q: To stop the sinkings a spy ring had to be broken, a German ship assaulted, and a secret radio transmitter silenced.
R: U-boats were torpedoing Allied ships in the Indian ocean faster than they could be replaced.
S: And the only people who could do the job were a handful of British businessmen in Calcutta-all men not called out for active service.
S6: Boarding party, James Leasor's latest best-seller is a record of this tale of heroics tinged with irony and humour.
The Proper sequence should be: