The Story of Mary Ann Doyle - first Companion of Catherine McAuley, by Bonaventure Brennan rsm.
This book has been reprinted by request and is available by e-mail: firstname.lastname@example.org
The story tells of the relationship between Catherine and Mary Ann, and details the origins of the congregation. It also details the spread of the congregation through Mary Ann's Further foundations over 25 years after Catherine's death. A nice easy read - very suitable for new members, as well as for those who wish to recall the early days.
Sisters of Mercy Northern Province Ireland