Brave and resourceful seventh grader Emma Mukhina is getting down to business again. This time she has to find out where her grandfather, Captain Cap, disappeared to! During the investigation, Emma will have to visit both under water and underground. And also solve a whole crime “crossword”... who is Lame Max? What is "buligongo"? How did an African sorcerer end up in a Russian town? All these questions will confuse anyone. But not Emma Mukhina! The young detective has done worse things!