Gosick!

Another anime I would recommend is Gosick! Gosick takes place in 1924 in a French-speaking fictional European country, which stretches in a strip from Switzerland, through the alps between France and Italy, to the Mediterranean Sea. The country is called it is called "Saubure". The story centers on Kazuya Kujo, the third son of a high-ranking officer of the Japanese Imperial Army, who is a transfer student to aprestige academy, where urban legends and horror stories are all the rage. There he meets Victorique, a mysterious yet beautiful and brilliant girl who never comes to class and spends her days reading the entire contents of the library or solving mysteries that even detectives can't solve. The series focuses on Kazuya and Victorique getting involved in different mystery cases!

This anime has many mysteries that need to be solved and if you like plot twists then you will love this anime! The ending concluded everything and was satisfactory! I would give gosick a 8/10