I ran up to book 4 but I highly recommend Extinction Curse. It gives your characters the chance to be mostly a chaotic group, the circus aspect can grow you and your players roleplaying abilities, and the enemies are just fun. I love the whole lizard people riding dinosaurs part of the campaigns.

I can't argue with abomination vault either because those 3 book adventures are amazing. I'm all about the roleplaying aspect of things and while Extinction Curse is a 6 book adventure, it is full of cool lore you can play with and the roleplaying combat aspects are so much fun. I adopted that same skill challenge combat thing and rerolled it over to make spaceship combat awesome for starfinder.