The Irony Elephants are back

I was trying to remember the title of the Agatha Christie novel I am currently reading. It has the word 'elephants' in the title.
So my memory come up with 'Elephants never forget'.
A good title by any standards, but not a novel by written by Agatha.
The book I am really reading is called 'Elephants can remember'.
It is obvious that ze little grey cells are not what they used to be...