After the battle -between ThunderClan and ShadowClan because ThunderClan had given ShadowClan a strip of territory moons (months) ago and Ivypaw had a dream which she told was from StarClan but was actually from the Dark Forest who were trying to come back to get revenge and tricked Ivypaw to train with them so they'd have more warriors- Russetfur, ShadowClan's deputy who was too old too be fighting, was accidentally killeds by Lionblaze -one of the prophesied Three who had the power of not being able to be injured during a battle. She (Russetfur) had already taken a life from Firestar and Lionb;aze had been trying to help Firestar.
Dovepaw overhears Lionbvlze and Jayfeather talking aboyt Ivypaw and realizes that she's training in the Dark Forest/Place of No Stars. At first, Dovepaw refuses to believe this, but, sfter confronting her sister, Dovepaw realizes it's true and tries to convince her to stop though Ivypaw refuses, accusing her of being worroied that suddenly the cats will fuss over Ivypaw instead of Dovepaw.
Before the battle, a tree had fallen on the camp, killing the elder, Longtail, and crushing Briarlight's back legs so she couldn't walk (paralyzed). Millie, Briarlight's mother, had been very upset and was arguing with Jayfeather, the medicine cat, about what he should do to help her.
StarClan tells all the medicine cats -except Mothwing, who secretly doesn't believe- that war will be coming and eack Clan must stand alone if they are to survive. However, Littlecloud, ShadowClan's medicine cat, doesn't believe that and refuses to give up his friends and medicine cat oath. Flametail, Littlecloud's apprentice, has a vision where he's trapped undder the ice in the lake and it comes true. Jayfeather tries to save him but can't.
Tigerheart, Flametail's brother, and Dovepaw, one of the Three, agree to meet eachother every night, but after Ivypaw discovers them on the border, a patrol comes by and Tigerheart has to take Ivypaw back to camp and ShadowClan exchanges Ivypaw for tansy and catmint because Littlecloud -the medicine cat- is sick.
Ivypaw overhears Tigerstar talking to Tigerheart and realizes that Tigerstar lied to her and was using her. He tricked her into helping him but after she realized that, she didn't want to go anymore. However, when she told the Three, she agreed to continue and spy on them.