Seeking an end to the mystery behind the death of the "real hero" of the country, Singh said it was the responsibility of the Union government to let people know the truth.
"The entire country is impatient to know as to how Netaji died and under what circumstances," the BJP president said while releasing a book on the great leader here on the eve of Netaji's birth anniversary here.
Rajnath also said that he would visit Netaji's birth place at Odia Bazaar in Cuttack and garland his statue before leaving the state on Thursday.
Former Odisha Assembly deputy speaker Rama Chandra Panda has written the book titled: "Subashbad, Antarang Adhayan" on the life and politics of Netaji.
Noting that Netaji's dream of making India the "Jagat Guru" (world teacher) was not fulfilled, Singh said that he wanted 'Bharat' to emerge as the economic superpower besides being a world teacher in spiritualism.
"Netaji's ideological politics and his life would be remembered by generations," the BJP president said, adding that January 23 was a historic day for the state of Odisha as it marks the birth anniversary of Netaji and Vir Surendra Sai.