Not all that surprising, tests on sourdough cultures have shown that after a few months the microbes in it will match the local atmosphere. So that 'San Francisco starter' you bought most likely only kept its San Francisco heritage for a few weeks.

I've never actually watched it, but there's a show on cable called "Murder, She Baked".

There are also the Lucy Burdette "Key West Food Critic" mysteries. (I haven't read any of them yet, but was a big fan of the Emma Lathen series 30 years ago, the protagonist being a Wall Street banker.)

I had a dream recently in which baking played a prominent role in a series of strange events, I'm not sure if there's enough for a book length story, but I added it to my ideas folder. (I'm currently doing some outlining and background research for a novel on a different subject.)