It is a very important book to protect the Holy Prophet (صلى الله عليه وسلم) against the slanders of the "Salafis". May Allah SWT bless the late writer, Shaykh as-Sayyid Muhammad bin Alwi al-Maliki al-Makki rahmatullahi alaih.
this is they famous book by shaykh sayyid muhammad bin 'alawi maliki makki rahimahullah. it has been translated into urdu by mawlana yaseen akhtar misbahi by the name islaah e fikr o i'tiqaad and is available from indo/pak booksellers. arabic version at www.sunnah.org