So it has been quite some time since I posted anything and I am not sure why. Perhaps I am now turning over a new leaf. At the moment one of the books I am reading is the Devotion to the Sacred Heart by Fr Jean Croiset SJ.
Fr Croiset was spiritual director to St Margaret Mary Alacoque and it was he whom our Lord commissioned, through St Margaret Mary, to write this book, the original book on the devotion. It's well worth getting and I found it clear, well-balanced and helpful. You can get it here at Book Depository.