How did the book ten little Indians end?

All the 9 killers who had escaped justice were killed in a different way. The first one was poisoned with cyanide, because he was the less guilty (he had killed two children in a road accident, therefore there had not been any intent to murder them). The remaining 8 will live their remaining days or hours in fear, the most guilty one dying last (a girl who was made to hang herself). The others were shot, injected with a deadly substance, killed with an axe, crushed by a statue, etc. The killer dies last, killing himself - I shall not reveal how.