Hercule Poirot is back, that fastidious and infinitely inquisitive Belgian detective whose little gray cells are in perpetual action.

Hercule Poirot, famous Belgian detective with magnificent moustaches and little "grey cells"

It features her famous Belgian detective, Hercule Poirot, and is set in 1946.

"The Belgian detective who was employed on the case asked me to search for it."

She approved of his portrayal despite the fact that physically he was far too tall for the dapper little Belgian detective.

Fortunately, the threat was never carried out; and in Mrs Christie's latest novel the little Belgian detective is in very good form indeed.

It features Christie's Belgian detective, Hercule Poirot, who makes a very late appearance in the final third of the novel.

Hercule Poirot - renowned Belgian detective famous for solving cases using his "little grey cells".

One can almost see the dapper Belgian detective at a corner table aligning the vase of red carnations with the tiny satin-glass lamp.

But even for the great Belgian detective, this is not a simple case.