If you liked "Gosick"
...then you might like

Title: Umineko no Naku Koro ni
Type: Anime
Original Creator: Ryukishi07
Genres: Mystery, Horror, Supernatural, Psychological
Summary: Umineko no Naku Koro ni takes place in the year 1986, during the time frame of October 4 and October 5 on a secluded island named Rokkenjima. The head of a wealthy family named Kinzo Ushiromiya, who lives on and owns Rokkenjima, is near death, and eight of his family members arrive on the island to discuss how Kinzo's assets will be divided once he is dead. Also on the island are three family members who live there, five of Kinzo's servants, and his personal physician. After the eight family members arrive, a typhoon traps them on the island and shortly after people start to get mysteriously murdered.

Source: link

If you liked "Gosick"
...then you might like

Title: Kuroshitsuji
Type: Anime
Original Creator: Toboso Yana
Genres: Action, Comedy, Demons, Fantasy, Shounen, Supernatural
Summary: In Victorian-era Europe, a young boy loses everything he once held near and dear to a vicious plot. In his moment of death, he strikes a deal with a demon: his soul, in exchange for revenge. Ciel Phantomhive is now the head of the Phantomhive corporation, handling all business affairs as well as the underground work for the Queen of England. His new partner is a demon butler, Sebastian Michaelis, whose powers as a butler is only surpassed by his strength as a demon.

The story follows the two along with their other servants, as they work to unravel the plot behind Ciel's parents' murder, and the horrendous tragedies that befell Ciel in the month directly after.

Source: link