The exposition is that Kevin and Max became friends again after Kevin moved back to where he used to live. This is the exposition because it introduces the two main characters.
The Rising action is that Max and Kevin went on a adventure to the sewer and they found a purse, then they returned it to the owner. This is the Rising action because the climax is building up.
The climax is that Killer Kane kidnaps Max and the Kevin saved Max From Killer Kane. This is the Climax because it is the turning point of the story.
The Falling action is that both Kevin's family and Max's family celebrated Kevin's birthday, but then Kevin git a seizure. This is the falling action because the story is about to end.
The conclusion is that Kevin died because his heart was top big for his body, also after he died Max wrote a whole book about their adventures. This is the Conclusion because it is the end of the book.
The theme is that friends have your back. I think the theme is friends have your back because when Max was kidnapped Kevin didn't give up and tried his best to find him and save him.