Shattered Sky was released on April 11th, 2017. It is the third book in the A Vision of Shadows arc, and follows the aftermath of Thunder and Shadow.
Darktail has taken over ShadowClan's camp, forcing Rowanstar and the remaining ShadowClan cats to retreat. He names his new group "The Kin," and rules with an iron fist. Violetpaw stays with The Kin, too scared to leave Needletail, the only kin she knows.
A battle starts at the beginning of the book, the Clans against the Kin, but the Kin wins, due to WindClan retreating in the middle of it. Due to this, tension between all the Clans grow higher and higher. In spite of this, Alderheart continues to receive dreams that signal a returning of the long lost Clan, SkyClan.
Twigpaw disappears, leaving Bramblestar and Alderheart to believe that she has gone to search for SkyClan. Bramblestar sends a patrol to search for her, and, in the mean time, Darktail strikes again, taking over RiverClan's territory. RiverClan takes refugee in ThunderClan's camp, much to the annoyance of their warriors. The search patrol for Twigpaw return, but they believe the young apprentice is dead.
Violetpaw agrees to become a spy in Darktail's camp to try to free the prisoners that Darktail had taken during his raid on RiverClan. She is asked to drug Darktail, and she agrees to do so.
It is revealed that Twigpaw is alive, as after being hit by a monster, she was healed by a vet. Despite her injury, she continues her search for SkyClan. Eventually, she succeeds, meeting their leader, Leafstar, and their deputy, Hawkwing. As Twigpaw takes SkyClan back home, Hawkwing reveals to her that he is her father.
Violetpaw attempts to drug Darktail, but Sleekwhisker foils her plan. Darktail believes that punishing Violetpaw would not be enough, and he brings Needletail and Violetpaw to the lakeshore. He starts to drown Needletail until Violetpaw proves her guilt, and Violetpaw eventually confesses, but he still drowns Needletail regardless. Darktail tells Needletail to kill Violetpaw to prove her loyalty to him. Needletail pretends to attack Violetpaw, but whispers to her to run. Violetpaw turns, knowing that Needletail is sacrificing her life for the black and white she-cat to escape. In the end, Darktail, helped by Sleekwhisker and Roach, drown Needletail.
The Clans arrive to the ShadowClan camp to see the prisoners fighting against their captives. Many ShadowClan cats have joined in to drive away the rogues, and once the rogues are defeated, they promise loyalty to Rowanstar again.
Upon returning to ThunderClan's camp, Twigpaw has brought SkyClan back with her. She introduces Hawkwing, her father, to Violetpaw, her sister. More introductions are made, and the medicine cats head to the Moonpool to visit StarClan. StarClan tells them that all Clans must be united again - referring to WindClan, who had closed their borders.
A patrol is sent to WindClan, and Darktail is attacking the WindClan cats. He is driven off, but promises they have not seen the last of them. Onestar explains to the patrol that he is the father of Darktail, asking the other Clans to help fight against his son. They organize a battle that plays to each Clan's respective strengths, and the battle is brought down to the lakeshore. Onestar and Darktail grapple there, and they drive each other into the lake. None of them resurface.
The Clans split up, and decide that, for now, SkyClan will share territory with the other Clans until they decide a place for them. Hawkwing asks Violetpaw and Twigpaw to join SkyClan, but both sisters are confused on where they belong - although they do know one thing for sure - that change is coming.