Last Chance

Adrien Agreste had a perfect life: He was Chat Noir, he was dating Marinette who ended up being his favorite hero in the world, and he was about to make the most important decision of his life,,,,could it possibly be marriage?
Then his world gets turned upside down when news spreads around the city of Paris:
The disappearance of Ladybug.
Depressed, Adrien takes on the role of second guardian of the miraculouses, as well as keeping his promise to Master Fu as hero of Paris until Ladybug's return.....but where is she? Did she leave? Why? What happened......?

3 years later, Paris seems to be getting darker and colder. He then starts to realize that he and his friends aren't alone. Strangers seem to appear and make everything go from bad to worse. What's more: even Hawk Moth has gone silent.
Why? Who are these people? Could they be the reason for Marinette's disappearance?