On the 30th of June 1908, an explosion with the destructive power of 2,000 Hiroshima bombs rocked the Tunguska region in central Siberia, felling more than 6,000 square metres of pine forest. The explosion could be heard within a radius of 1,000km. Witnesses saw an oblong object, glowing in a blueish-white light, fall from the sky. A 20km high pillar of light was followed by a mushroom-shaped black cloud. The three following nights were so bright all over Europe that you could read a newspaper outside without additional light. In California, on the other hand, they noted a continuing reduction of sun light.

Up to this day it is still not clear what really triggered the Tunguska catastrophe. These are the most prevalent theories:

• An asteroid or comet crashing to the earth - but why was there no crater to be found?
• A vulcanic-like eruption, probably of natural gas - but how does this explain the growing radioactivity in the Tunguska region?
• A (natural) nuclear explosion - but why do the trees bear no evidence of a fire?
• A small black hole - but where is the exit hole?
• The crash of an extraterrestrial spaceship - but why was there no UFO wreckage to be found?

So far, no hypothesis can logically account for all of the facts and features surrounding the Tunguska catastrophe. It could have been a thermal, chemical or even nuclear explosion.

Nina is torn from her normal life when she finds that her father has disappeared without a trace. The police cannot (or will not?) help her, so Nina begins searching for clues about her father's whereabouts on her own. In the course of her investigations, she meets Max Gruber, a young colleague of her father's, who spontaneously offers to help the pretty young woman. Together they soon find out that Nina's father was involved in a previous expedition to Siberia that set out to investigate what lay behind the mysterious Tunguska catastrophe of 1908. At the time a huge explosion triggered an inferno, and the reasons behind that remain a mystery to this day.

Nina and Max soon realise that events of that time are linked to her father's disappearance. Their search for answers leads Nina and Max to the most distant corners of the earth (Berlin, Moscow, Cuba, China, Antarctica etc.). Soon it becomes very obvious that some mighty opponents are also interested in the secret of Nina's father. In the end it turns out that this is about much more than just the disappearance of an old man.

The adventure series Secret Files is to be released on Nintendo Switch, starting off with Secret Files Tunguska which is set to launch on November 30, 2018.

Features:

• An interactive mystery thriller
• 12+ hours of suspense-laden playing time
• 2 playable main characters
• Dozens of NPCs with individual background stories
• Lots of demanding quests, riddles and puzzles
• More than a hundred exciting locations
• High-quality graphics with amazing attention to detail
• Full voice acting by popular dubbing actors
• Fully localized into German, English, Russian, Polish, French, Spanish and Italian