The Last Orphan by N.W. Harris
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Easy to read, highly addictive, and at times really disturbing. I read it as a horror novel but for others it will probably be an action packed young adult novel.
The main character, Shane, loses his granny and has a huge fight with his father after the funeral. On his way to his granny's empty house, Shane notices some odd things - the weather is changing and the animals act strangely. A few hours later all the adults are dead and the kids have to find a way to survive in this new dangerous world. Shane and his schoolmates have to band together, make some really tough choices and later live with those.
The main characters had depth. I liked how they had all those mixed feelings. It made everything more realistic. Also, they didn't always agree to each other, nevertheless these kids found ways to support each other and move on. And they weren't smug at all (look at the book cover), they were dirty, exhausted, numb, and lost. They had doubts but they didn't have the luxury to give up when over 60 kids depended on them.
This book was heartbreaking, gory, and as I wrote before very addictive.
It is also free on amazon at the moment.