When it comes to murder mysteries, faith is not usually a player. It is, however, when the sleuth is a nun, as is the case in this book. And faith is also important to the author, Carol Anne O'Marie (1933-2009), for she also was a nun. When Sister Mary Helen wins a trip to Spain, she and her companion, Sister Eileen, are thrown into a group of strangers Like all people the other travelers have secrets, but one of the group may know more about those secrets than is good for her. Sister Mary Helen is very much in the tradition of other clerical sleuths, such as Father Brown and Sister Joan, but she is also quite elderly, a trait that often causes people to underestimate her more than religious nature, and makes situations that much more dangerous. Like a regular detective, Sister Mary Helen follows clues, questions suspects and makes observations, but where murder to a police detective is a matter of breaking the law, murder to Sister Mary Helen is a matter of sin; when it comes to bringing people to task for their sins, she has a very demanding client. This book, and others in the series, will appeal to the reader who appreciates detective fiction with a firm moral compass.