A great story, a good plot, many interesting characters, and a difficult task in finding who and why there is a killer targeting young heiresses in cruise boats along the Danube. Adele and John go through some funny events and difficult and threatening ones to find the culprit. John is, as always, the best and the worst partner for Adeledoing exactly what he wants and not what would be best. There´s also the intertwining with the Spade killer who happens to be in the same area as the boat killer is acting and there are some very interesting developments in trying to capture him. A good plot, well written, where other sides of Adele´s, her father´s, and John´s characters are shown.
I couldn´t stop reading to learn who were the culprits and how the story would end. Looking forward to the next books in the series. Really entertaining!