I've read all the books in the Rushed series so far and each of them had their own quest that Eric is thrown into and you don't necessarily have to read them all to understand them individually. There are some characters and things that are understood easier if you've read the previous books but it's not mandatory.
So in this book we find Eric at a semi defunct family play attraction that features an arcade, a 2 story play area, a party room and multiple activities, like laser tag, go karts and a carnival midway, that are no longer in use. His wife is the party planner for an 8 year old birthday party that Eric is forced to come help at, mainly to keep his wife sane from her snooty and overbearing mother and sister.
But as soon as he arrives he senses that something is wrong with the building (aside from the fact that it's FILLED with plastic clown statues!!) He is harassed, chased and constantly bothered by a skinny clown with the ability to throw Eric into very real delusions that have all kinds of horrors attacking him.
He is assisted by a few friendly characters that only he can see, and they give him information and clues how to defeat the evil in the building before the party is over and it escapes into the real world.
This was one of my more favorite of the Rushed books. I really enjoyed the characters, the villain, the twist at the end and the location where the story takes place was a fun offering as well.