A 31-year-old Indian Foreign Service (IFS) officer from Gujarat,still in his probation period,has come out with a book in which he gives an account of his efforts and success in the UPSC exam. The book,Mission UPSC: Mari Safalta Nu Rahasya (secret of my success),written by Rohit Vadhwana,will be released at the book fair on Tuesday. Hailing from Okha in Gujarat,Vadhwana,a 2010-batch officer,is only the third person from the state to have entered the elite foreign service in the last 20 years. Vadhwana is scheduled to be sent to Iran as a third secretary on probation before being confirmed as an IFS officer.