The Secret of the White Lady

At the end of the 1950s, the successful chess player Liz Harmonika disappears without a trace on the night before the most important game of her career is to be completed. The Russian secret service is likely behind it, wanting to prevent her from defeating the until-then unbeaten grandmaster Vadim Popow. Your task now is to find out how the game can still be successfully finished — time is running out. Your team has 90 minutes to follow every clue and seize the victory!