Months after the fiasco with Louise, Marinette and Adrien are happily dating (privately, of course). Everything has returned back to normal due to their biggest threat remaining under the radar. However, a new threat is unveiled when Marinette discovers a disturbing clue; a clue that could dramatically harm not only herself, but all of Paris. Looks like Marinette and Adrien are not out of the woods yet. And it seems someone knows more than they are supposed to...