The story starts with Max reflecting over the past when he was in daycare with Freak. Max lives in the basement ( what he calls the down under) of an old house with his Grim and Gram. Maxes mother was murdered and his father is not in the picture. Max is very big for his age. It is around The Fourth Of July maybe late 90's the summer before 8th grade.
Climax
A new boy named Kevin (Freak) moves into the house next to Max. Max comes over to Freaks house and they start to have a conversation . Max takes Freak home to his room and after a short time Freaks mom comes to find her son. She sees Freak and runs with him out of Maxes room. Freak is a small, disabled person.A short time after this Grim and Gram call Max upstairs to talk to him about this. Turns out Freaks mom thought that Max was his dad, which upsets Max. All Max ever hears is how much he looks like his father. After a short amount of time Freak and Max become friends and go on to become Freak The Mighty.
Falling Action
Late one night the two boys (Freak and Max) go out and dig into the sewage and find a lady's missing bag and later return it to her house. Her name was Loretta Lee and once they return the bag, they get dragged into her house and get asked for the money that was in the bag. The boys got out of that situation and carried on with their lives like normal.
Resolution
Freak and Max were at school and the speaker in the classroom asks for Max to the office. As Max is walking up to the office he thinks he is getting in trouble, and that he will be put in the learning disability classes again. Just turns out that his father got out of jail and wants to see Max. Max hates this idea and freaks out about it. The teacher assures him that he will not have to do anything he doesn't want to do, she sends him back to class. One night while Max is sleeping, his father kidnaps him and takes him to Loretta house for hiding. He even attempted to kill Max once he disobeys him. Freak comes to rescue Max.
On his 13th birthday, Freak unexpectedly has a seizure while he is checking out his birthday gift.
After a long time of waiting to see Freak in the hospital, he finally gets to see him. Except for only a short amount of time after that, Freak passes away. Max and the rest of Freaks family and friends must grieve his death.