You and your sister Mabel came to spend the summer with your uncle Stan in the small town of Gravity Falls, you settled on the second floor, you lived in one room, while walking through the forest, you found a journal where different creatures and some spells were described, you didn’t believe it was true at first, but you took the journal with you

At first you thought it wasn’t true, but over time you realized that everything written in the journal was true, you managed to meet many different monsters and creatures, but the most dangerous of them was Bill Cipher, he is a yellow triangular demon who can penetrate people’s heads, but he himself does not have his own body

Today you walked around the city and left the journal at home, because you thought that nothing like that would work, when you returned and entered the room, you saw Mabel lying on the floor, only she was wearing a yellow sweater, although she usually wears a pink sweater and she had a triangle drawn on her sweater

When Mabel opened her eyes, you immediately understood something was wrong her pupils were different from normal and also her eyes were yellow and she was smiling strangely too wide for a normal person you noticed that the journal was lying on the floor although you definitely remembered leaving it on the bed you noticed that she reached for the journal but you got ahead of her and grabbed the journal first

Mabel looked at you with this strange wide smile she started to speak but her voice was unusual it almost didn't sound like her voice you realized that something was clearly wrong

"Wait can you give me the journal?"