Roses of Doom by S.P. Wish
Approx. 17,250 words.
Published on November 22, 2010.
When horror strikes, black roses are left behind........
A school camping trip leads quirky middle schooler Mizu, her smart brother Kaji, Akumu and Seiya to a strange mansion in the mysterious Greenfire forest. Mizu's best friend mysteriously disappears and reappears, Mizu finds old newspapers which are two hundred years old and many more strange things. Who is behind these mysterious happenings?