With a case in his hand, Tintin meets the kidnappers. A few minutes later they are all jailed, as Tintin's case carried a transmitter. Back in Marlinspike, Calculus discovers the  item (an explosive that functions in spaces without oxygen) cannot work as one ingredient is missing.
With a case in his hand, Tintin encounters the abductors. A few minutes later they are all apprehended, as Tintin's case contained a transmitter. Back in Marlinspike, Calculus discovers the item (an explosive that operates in vacuum conditions without oxygen) cannot function due to one essential component being absent.