Stanley Yelnats escapes Camp Green Lake shortly after Zero does. He finds Zero under an old boat called "Mary Lou". Zero has been living off of an old stash of jam he calles "sploosh".
Stanley and Zero pack a bag with empty jars and sploosh. They also take Zero's shovel. They head off to God's Thumb, and mountain, looking for good luck. Stanley's family is prone to bad luck, so he hopes Zero will help.
When Stanley and Zero start up the mountain, it is a hard journey, but they make it to the top.
Once they are at the top, they live off of sploosh, muddy water, and onions found in the ground. Shortly after, though, they decide to go back to Camp Green Lake.
Stanley and Zero work in one of Stanley's holes, where Stanley had found treasure, hoping to find more. They eventually do find a suitcase full of paper.
By the end, with Zero's help, Stanley's lawyer is taking them both back to town, which goes on to say that with the help of friends, bad luck will not come and harm you.