coup de main - noun
kü-də-ˈmaⁿ
Definition of coup de main : an attack that achieves complete surprise.

Here's some excerpts from Florence Welch's book 'Useless Magic'.

In the lead-up to the release of Florence Welch's first ever book 'Useless Magic' (out on July 5th), a few excerpts have been shared from the title which feature handwritten notes and doodles.

More info about the book here.