This graphic novella served as Greg Rucka's statement of intent on the direction he planned to take his time on writing Wonder Woman. He was brought in after the whole "dark age of comics" had finally lifted and (much like he is doing now in the DC Rebirth-era) was tasked at putting DC Comics' lead superheroine on the right path again. This book gives us a sample of what he planned to do. 
 I will not get to bogged down in details/recap, but since Wonder Woman vol. 4: Destiny Calling ended Wonder Woman had become the ambassador of Thymiscura to the United Nations and was the Goddess of Truth for awhile. This story picks up when a mysterious woman goes to Diana after a violent confrontation with another man. Ominously, this woman is followed by The Furies and the first thing this woman does is perform the titular oath that binds her and Diana together with the added bonus that breaking the oath is instant death at the hands of The Furies. 
 This was a very good story and my only criticism is that it comes to an end the moment the twist is revealed. Beyond that it is great story and shows why Rucka was such a natural at writing this character. 
 I read this as a part of Wonder Woman By Greg Rucka Vol. 1.