How does Agatha Christie creat suspense in And Then There Were None

In Agatha Christie's play And Then There Were None, and in the novel, she builds suspense by creating a closed setting where one of the characters must be the murderer, by using the rhyme and the Indian boys to predict and mark each death, by killing off characters one by one, and by varying the methods of the murders.

Explanation:

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- "the die is cast; i have consented to return if we are not destroyed. thus are my hopes blasted by cowardice and indecision; i come back ignorant and disappointed. it requires more philosophy than i possess to bear this injustice with patience. i have lost my hopes of utility and glory; i have lost my friend."