"A Vow So Bold and Deadly" is a fantasy novel written by Brigid Kemmerer, and it is the fourth and final book in the "Cursebreakers" series. The series is a young adult fantasy series that blends elements of contemporary and fantasy fiction. It features a world where magic and curses exist alongside more modern-day settings and concerns.

The "Cursebreakers" series follows the stories of several main characters, each with their own unique abilities and challenges. The first book, "A Curse So Dark and Lonely," introduces readers to Prince Rhen, who is cursed to repeat the same season over and over again until he finds true love. The second book, "A Heart So Fierce and Broken," shifts the focus to Grey, Rhen's loyal commander. The third book, "A House So Empty," explores the character of Lia Mara, a princess from a rival kingdom.

"A Vow So Bold and Deadly" continues the story, bringing together the main characters from the previous books as they confront the looming threat of war and the curse that has plagued Prince Rhen. The novel delves into themes of love, loyalty, duty, and the consequences of one's choices.

It's important to note that "A Vow So Bold and Deadly" and the rest of the "Cursebreakers" series have been generally well-received by readers and critics alike for their engaging characters, intricate world-building, and emotionally charged storytelling. However, like many books, it may also have faced challenges and controversies, as is common with any work of fiction. Critics of the book or the series might have raised concerns or objections related to specific content, themes, or portrayals within the story.