But concealment operates on other levels, too. Initially, the guests hide specific details about their lives from one another. At various points in the novel, the characters conceal their true thoughts and feelings. Of course, the island is a geographical manifestation of concealment. It is, in effect, cut off from the mainland. Finally, the storm further conceals the events happening on Indian Island from the rest of the world.
Because the murderer has discovered the truth about each individual, the novel suggests that no matter what method of deceit is employed, the truth can never be fully concealed.
And Then There Were None: Theme Analysis