Frozen Summer

Prolouge
Crinkledleaf, Blackdawn, Branchstep and Wheatherbird walked along the bare grass. Their paws crunched dried, dead leaves that littered the ground. 
" I don't understand why Henstar wanted us to check this area out." Wheatherbird hissed as she flicked a leaf off her paw. 
"Because AutumnClan needs the territory. We need to see if it's safe." Crinkledleaf said, giving her a meaningful stare. He felt Blackdawn step to his side.
" Our kits need to be safe. How could they if we adopted a bunch of mangy foxes along with new territory?" He hissed.
The small group of cats reached a ridge overlooking a clear pool of water surrounded by berry bushes.
"Wow...." Branchstep breathed. His eyes were filled with awe. A lazy breeze ruffled their fur. Blackdawn ran down, picked a berry, and pawed it to Branchstep. 
" Here." He said. Branchstep ate the berry. Suddenly he began to wheeze, and gasp for air. He collapsed onto the ground, spazams enveloping his whole body. In a matter of seconds, the strongest cat with the little patrol was dead.
The remaining cats looked on helplessly. Then, spitting, Wheatherbird spun to face Blackdawn.
" You fed him a DEATHBERRY you mouse-brain!" She growled.
Blackdawn didn't move. He just looked smug. " It wasn't mouse-brained. No, I meant to do it. And now, you can join him." 
Without warning, Blackdawn leapt onto Wheatherbird. She was completely unprepared for the attack. His sharp claws slashed her throat. Blackdawn left her lying there, dying, blood streaming from her throat.
" Why Blackdawn!?" Crinkledleaf gasped as Blackdawn advanced. 
" Because I don't want my Clan to have this territory! My secret mate and kits live here, and I don't want them part of your weak Clan. I will return, say you all died by a vicious fox gang up, and poof. No more territory." Blackdawn said scornfully. He leapt at Crinkledleaf. 
Slashing claws and pained howls shook the earth. The battle seemed to go on for a long time, until Blackdawn finally fainted for loss of blood. 
Crinkledleaf dragged himself back to camp, alone, mourning his dead clan mates.
No one can ever go there. If Blackdawn survives, he will murder all these cats until he gets to me...
TO BE CONTINUED