"I'll borrow a cape, if you don't mind," says Combeferre.

He scribbles a note to Enjolras:

My dear Enjolras,

I've gone with Joly to the Labyrinth. I told you that we've meant to explore it for some time, and we've been planning our expedition. We have had to speed up our plans thanks to Bossuet and Courfeyrac sneaking off to the Labyrinth while drunk. We're going to extricate them and hopefully learn something about the Labyrinth as well.

Regards,

Combeferre

Then he looks at Joly. "Let's contact them on the watches as well?"