I love this description because it is typical marketing department (I’m a marketing person so I can say this, lol) babble for:
We can’t tell you anything about this episode because it will give away the whole plot (and possibly the plot of the episode that precedes it), so we’re going to write the most vague description ever that simultaneously reveals nothing and sets everyone’s hair on fire with speculation.*
*Except for that wrinkle of the crossover and our stars’ social media posts which very obviously reveal some things by default, but please just ignore those.