Nemo Rossi is the pen name of two Finnish authors, Mika Rissanen and Juha Tahvanainen.
Rossi is known for his his young adult thrillers, Arkeomysteeri (Archeomystery) series. In the books, taking place either in contemporary Italy or Greece, three teenagers solve crime mysteries linked with ancient mythology and history. Rossi's novels discuss e.g. the legend of the Roman birth myth and the legacy of Alexander the Great.
References
Nemo Rossi Wikipedia(Text) CC BY-SA