However, there is no book with that exact title by Conrad. "DAR and Spear Thrower" is not a published book.
There are several possibilities:
* Misremembered title: You might be thinking of a different book by Conrad. It would be helpful to know more about the story or characters you remember.
* Fan fiction: There could be a fan-written story with that title, but it would not be a published work by Conrad.
* Typo: There might be a typo in the title you are trying to recall.
Please provide more information so I can help you find the book you're looking for.