Warning:
This post and/or comments on contains information as to the plot and may ruin it for you.
There are ten main characters in the book, that are all invited to an island and slowly killed one by one. The murderer I think is satisfying a need of power over others. I think the murderer is trying to bring justice to all the people on the island becuase they all comitted murder and got away with it. The other nine people are showing a need for survival by trying to figure out who the murderer is before they are killed. Why do you think the Justice Wargrave was so sure that Vera would kill herself, and why did Justice Wargrave make the whole rig to have the revolver shoot him if he wrote the confession?



