Attacking or changing your Form will always spend your Sense of Urgency, if you have one. You can also find your way to this storylet through some Opportunity Cards.
or a redirect from:
*Fourth-tier lodgings cards:
**The Western Tower: An opening in the Game of Knife-and-Candle!
**The Tower of Sun and Moon: An opening in the Game of Knife-and-Candle! 2
**The Lofty Tower: An opening in the Game of Knife-and-Candle! 3
*Opportunity cards for Persons of Some Importance:
**A Polite Invitation: What's that written on the back?
**The Soft-Hearted Widow: Meet her eyes and make the Sign
*An opportunity card for those with Criminal Connections:
**An implausible penance: A Knife-and-Candle Opening
*Rare opportunity cards:
**A little omen: Choose the knife-card
**'A dusty bookshop: Select that slim grey whale-leather volume.
Note that if you have this visible in the list of storylets due to having A Sense of Urgency, and you also have one of the cards below that gives you an opening, use the visible storylet first - using an opening from a card will remove this from the list of storylets so you lose it.