Sister Mary Helen goes on a retreat with her Irish friend, Sister Eileen at St. Collette's Retreat House in Santa Cruz. They find out they are a week too early but decide to stay on with the priests who are starting their retreat. Within a day, Sister Mary Helen finds a body and can't help but try to find the killer with the help of Kate Murphy, her friend who happens to be a homicide investigator from the SFPD.I enjoyed this book which I would classify as a cozy, Catholic Fiction mystery in the style of the Father Dowling Mystery series. Sister Mary Helen has a whole series for those who enjoy murder mystery, solved by nuns.