Of Magic 04 - Briar's Book: Pierce, Tamora - Circle

According to Wikipedia , this book concludes the initial journey of these characters before they transition into the The Circle Opens quartet as older students.

is the fourth and final installment in Tamora Pierce's Circle of Magic quartet, focusing on Briar Moss, a former "street rat" with a magical affinity for plants and greenery. Plot Summary

Unlike the previous books that focus on external threats (pirates or forest fires), this story deals with a biological threat. It highlights the intersection of magic and medical science. Pierce, Tamora - Circle of Magic 04 - Briar's Book

They provide the magical infrastructure—thread, lightning, and metal—needed to isolate and destroy the virus. Setting

As the epidemic escalates into a full-scale crisis, the four young mages of Winding Circle—Briar, Sandry, Tris, and Daja—must combine their unique elemental powers to find a cure. The story takes a deeply personal turn when Rosethorn herself contracts the disease, forcing Briar to risk everything, including a journey into the realm of the dead, to save his mentor and the city. According to Wikipedia , this book concludes the

Briar’s mentor, a dedicated dedicate of the Earth Temple whose life hangs in the balance.

While Briar and his teacher, Rosethorn, are searching for new plant specimens in the city of Summersea, they discover a mysterious and deadly disease spreading through the city’s poorest districts. Known as "Blue-Tick," this plague is highly contagious and resists traditional magical and medicinal cures. It highlights the intersection of magic and medical science

The protagonist, whose plant magic and knowledge of the "gutter" become essential in navigating the plague-stricken city.