Charles booked the hotel with his credit card, the one with the paperless billing.
Good old modern communications he thought, no paper, no bills, no traceability and what you do is between you and your banker and no-one else’s business.
Perfect for the married man who likes a bit on the side and likes to keep it discreet.
There was no point in upsetting the Michelle by flaunting his misdeeds under her nose, then she’d spoil his fun and his escape route.
But if only Charles appreciated that everything left a trace.