Little Jirka is at a new school for the first time and is immediately unlucky. When his classmate Ema's backpack goes missing from the school playground, Jirka is the main suspect. He gets a magic mirror when he gives an unknown woman a snack. Jirka becomes invisible and it is up to him how he uses this ability.
A series of ghastly murders is being committed. The one similarity in each of the murders is that a weird buzzing sound is always heard right before the murder occurs. Is the killer invisible or possibly some other incredible creature?
Boxer Tommy Nelson is accused of killing his manager. While detectives Bud and Lou investigate they come across an invisibility formula with which Tommy injects himself rather than face the police. This sparks an idea for trapping gangster Morgan by having Lou fight champ Rocky Hanlon, with Tommy's invisible help
Four years ago, sailing competitor Guo Chuan, who was sailing across the Pacific Ocean in a solo sailboat, lost contact with the shore team after 3pm on the 25th when sailing to the waters near Hawaii.