Capybara Detective. The Case of the Invisible Villain

There are troubling rumors in the zoo: a viper is on the loose, and someone has bitten the turtle. Almost simultaneously, the shell of Ella the snail disappears, and the monitor lizard Van goes missing from the aquarium. The detective friends begin to investigate whether these cases are connected and seek answers by the pond and in the terrarium. Behind each mystery lies attentiveness, guesses, and the ability not to take the first explanation as the correct one.