In their fourth year, the students of the School for Good and Evil are sent on Quests for Glory, which they must complete to graduate.

Dean of the School for Good, Professor Dovey, gives them a new quest to stop the attacks on the Endless Woods.

The group is captured at Jaunt Jolie where Sophie and Agatha are taken to a "snake" covered in knife-like "eels".

Back at the castle, Tedros chooses his mother over his steward, Lady Gremlaine, prompting her to leave.

At Nottingham, they capture the snake who escapes using Kei, a former Camelot guard, who tricked Dot into giving him the keys.

After killing the snake, Rhian proposes to Sophie, who accepts, and asks Tedros for the key to the case which is being used to protect Excalibur.

NPR noted the "truth and lies" theme in the book as well as the similarity to J. K. Rowling's Harry Potter series.

Chainani said he tried to replace the "warm safety" of the Harry Potter series with instability and uncertainty to make his readers "feel slightly uneasy the entire way through.