Yellowfang's Secret is a children's fantasy novel written by Cherith Baldry under the pseudonym Erin Hunter.

The book takes place chronologically at around the same time as the other Super Editions Bluestar's Prophecy and Crookedstar's Promise.

Brokentail trains his apprentices with extreme methods, which go unchecked as his father refuses to see the wrong in his son's actions.

Brokentail eventually murders Raggedstar to gain control of the Clan, while blaming the death on neighboring WindClan.

Brokenstar, however, rejects all criticism, continuing the attacks and eventually implementing extreme tactics to sustain his war efforts: he begins training kits before they are six months old (the age laid down in the warrior code as when apprenticeship may begin), and asks the Clan's elders, who cannot contribute to the fighting forces, to leave camp in order to save resources.

The manga chapter at the end of the book details Yellowfang, who has become the medicine cat of ThunderClan, feeding the now blind and captive Brokentail (who has been stripped of his -star suffix due to his crimes) deathberries, and revealing that she is his mother.