The First Riddle
Kristina and Dakota were walking home from school. They held their backpacks in their hands since it hurt their shoulders to carry them on their backs.
Kristina went to her house which was four blocks from the school. Dakota went to her house which was three blocks from the school.
It takes Kristina 20 minutes to get to school and back. It takes Dakota 15 minutes to get to school and back.
Kristina emptied out her backpack on her bed and sifted through all the things. There was a red textbook, a blue pen, a yellow highlighter, an orange notebook, a green set of gym clothes, a purple headband, and a light grey hanker chief that had her last name on it.
Dakota emptied half her bag on her bed as well. She sifted through the items. There was a yellow textbook, a blue folder filled with homework and other documents, a green pen, an orange set of gym clothes, a red book, a purple notebook, and a black handkerchief that had her last name on it.
The two girls put their stuff back in their bags and put them beside their dressers.
Someone knocks on each girl's door, and asks to come inside. The girls let them in and they go into their rooms. Each person looks around the girls' rooms.
The woman in Kristina's room spots a poster that has a disturbing picture of a dying girl on it. When confronted about it, Kristina answers truthfully, "Who is she? I don't know." The woman asks another question. Kristina answers, "Yes, I did take this picture." The woman asks yet another question. Kristina replies, "I do not know where I was when this happened. I cannot even tell you if it is real, for I myself do not know."
The man in Dakota's room spots a mysterious box. When confronted about it, Dakota answers truthfully, "Just some pictures in there." The man asks her, "Pictures of what?" Dakota replies, "I have no idea." He then asks her, "Did you take the pictures?" She answers yes.
Both people leave the house and go to the school. One of them is found dead 40 minutes later. The person has a dark grey smudge on it's mouth and a stab wound in it's back. There is an orange mark on the person's hand, a red mark on the person's shoe, a blue mark on the person's wrist, the word Alice is written on the person's throat in green, and a yellow mark on the person's leg. The police interrogate the two girls.
Kristina said she never saw the person in her life.
Dakota said she never saw the person in her life.
Both girls were telling the truth.
The police knew that the person died that night had visited one of the girls. They didn't know which one they visited, though.
They checked both girls' backpacks.
They found a grey knife in Kristina's backpack covered with dried blood, a grey handkerchief, a red textbook, a blue pen, a yellow highlighter, an orange notebook, green gym clothes, and a purple head band.
They found nothing in Dakota's backpack.
Who did it?