Prime Minister Narendra Modi on Tuesday unveiled a book by Lok Sabha Speaker Sumitra Mahajan here."Matoshree" -- a play based on the life of Devi Ahilyabai Holkar, the Queen of Malwa Region from 1767 to 1795 -- was written by Mahajan decades ago."I have written the book but I am not a writer," Mahajan said while welcoming the Prime Minister and other Members of Parliament at a function here."I wrote the play and it was staged in Indore and other places but I never wanted it to be published as it could have had discrepancies," she said, adding that her friends insisted on its publication and a historian friend from Indore checked it and got it printed.Modi, his Cabinet Ministers and MPs including L.K. Advani, sat in an auditorium at Parliament premises to enjoy the play on the life of Holkar after the book was released.