My two favourite things combined with a Firefly reference in the latest Christoper Brookmyre novel, when one of the characters turned out to be a huge Firefly fan.
There are a few other Firefly references because of that too, so the author obviously knows the series.
The book in question is called 'Attack of the Unsinkable Rubber Ducks'
by Christopher Brookmyre.
He's a stunning writer and worth reading anyway,
you can find out more about him and his other work here: