What is this post-it about?

jouest thought this was worth mentioning said

IRK DuFrense knows how she likes her coffee and she knows how she likes her investigations.

A splash of cream. A spoon of sugar. Three dashes of danger.

Except there’s something in the sugar dish, and it ain’t just sugar. It isn’t danger, either, which is equally disappointing.

“Mel --> release valve, Dublin?”

What do you amateur sleuths make of this?