The three detectives are his young friends Bob Andrews, Pete Crenshaw and Jupiter Jones. They live in a town near Hollywood. Their stronghold is a salvage warehouse, their headquarters is an old caravan in which they have equipped a crime laboratory. Their agency "Three Detectives" reveals any secrets, riddles and puzzles. Friends-detectives boldly take on the most important and complicated cases and bring them to the end with honor.

The Mystery of the Singing Snake A mysterious, piercing singing echoes throughout the old Jamison estate. Young Ellie is inclined to blame everything on the guest, Mr. Ariel, a strange man who does not like daylight. The strange guest is taken under the protection of powerful forces - evil spirits and a singing snake.