On Saturday, May 9, 2020 at 3:06:08 PM UTC-4, Jonathan St. Cloud wrote:
... I carry in my flight wallet ... a credit card from one of my ex-wife's
accounts. I know if I use that card she will come find me wherever I am.

My wife was very impressed by this logic.
She wants to know, as you've written imprecisely:

Is that one of many cards from one of your ex-wives?
Or one of many cards of a specific ex-wife?

Enquiring minds want to know.