The story begins with the three students of the University of Massachusetts, Boston, who share an apartment. They spend their time solving mysteries and have fun with their friends, but their lives are always full of complications. One of them is the suspicious roommate, Shana, who is always thinking about the best way to solve the mystery. The other is the extroverted and boisterous Rina, who is a real detective. The last one is the reserved and quiet Tiana, the university's best student. They all live an exciting and adventurous life, but their lives are never easy.

In the first chapter of the story, the three friends meet for the first time and start to spend their time together. They are going to the library to study and solve a mystery. They are going to the same place, but they have different goals. Rina wants to study and solve the mystery, but she is afraid that she will be the one who is going to get stuck with the unsolveable mystery. She is afraid that she will be the one who is going to be sick.

The first mystery that the three friends have to solve is a mystery about the university. It seems that the students are not the only ones who are going to the library. There is also a grandpa who is going to the library. The problem is that he has been missing for some time. It is possible that he is the victim of a crime.