2 people pretending to be something they're not!

A plague, 2 people pretending to be who they are not and a masquerade ball. Sounds like a good story! I'm really curious to know how Seraphina and Nico actually meet and to find out how many people are still alive. Mori roja sounds like a terrible plague but it sounds ike Seraphina and Nico encounter things that are even worse.