Good 7

I'm a detective. I was suddenly assigned a mission. So I ended up on this cruise. It's always like this. Tired. There was an old man among the passengers. He stayed in his room, saying he was tired. I played poker with the others. It's the best way to read people. Something felt off. It looked like they were all acting. I didn't like it. Except her. She was truly absorbed in the game. And yet, she kept losing. We played late into the night. Then I went back to my room. Felt good. A loud noise woke me. There'd been a murder. The old man was dead. The captain asked me to investigate. I questioned everyone. Again, it looked like they were all acting. I didn't like it. Except her. She showed real interest in the case. Reminded me of my younger self. I felt a little better. Their belongings were found at the crime scene. They were incredibly careless. I didn't like it. Except her. They all have alibis. They're covering for each other. Ouroboros? Kidding me?...