English is not my native language, so this explains everything.
I'm looking for (I searched for some time) a short novel or a story by, I guess, a French author I readed long time ago. As I remember, the main visible argument is as follows:
>A dissident political activist has the possibility to travel to the future.
>The time travel is occasional, unique and can not be repeated.
>Members of his group decided to use the occasion for a political purpose.
>The time traveler will kill the tyrant in the future.
>The plan fails because the tyrant knows the plans of the plotters.
>In the future, they were waiting for the time traveler.
>Alone, defeated, the last member of the group writes the chronicle of his teammates and the failed plot in a library.
>Save the manuscript into a book.
>He wonders who was the snitch.
>Bitch don't realise is he himself.