The story centers on a group of graduate students studying art and history in Rome. Two of the group met middle aged librarian Jacqueline Kirby and introduce her to their group, the Seven Sinners. A hanger on of the group is found murdered, found by a member of the group and possibly also murdered by a member of the group. One of the group, Jean, begins to have a series of accidents that soon become more violent and appear less and less accidental. Jacqueline Kirby decides to investigate this matter and, of course, manages to uncover both murderer and motive.
This book was written in 1972 and does show it's age a bit, hence the 4 rather than 5 stars. Even though this is the first Jacqueline Kirby details about her are left vague. We learn there are grown children but nothing about a Mr. Kirby.
The book is enjoyable and I look forward to reading the rest of the series.