This story is, basically, one day in time, Friday, June 22nd (for no particular reason), when an unexpected and frightening event occurs, and everypony is struggling to find out what it is, preparing for their worst fears.

This story is told in each chapter independently and completely, similar to a Simpsons episode "Trilogy of Error", however I recommend reading the first chapter first and continue in order, as the latter chapters contain more spoilers, with the last chapter completely revealing the plot.