A thesis statement for The Lost World should focus on the theme that adventure leads to self-discovery.
A thesis statement is the focus for an essay. Usually in literature we choose a theme to explore in the thesis statement. Often, one line from the story will serve as an inspiration for your theme.
"There are times, young fellah, when every one of us must make a stand for human right and justice, or you never feel clean again." (ch 6)
Clearly, this book is a story of a journey. A good thesis statement will focus on the theme of this journey. Here is a potential thesis:
In The Lost World Doyle explores the theme that adventure leads to self-discovery.
Everyone reaches a point where they have to make a choice. Raxton’s point is that sometimes your journey is mental as well as physical, and on every adventure you find out more about yourself.