A letter with Harm's name on it, and a messenger with a sketchy boyfriend. We can work with that.
Speak to the messenger again - she may be interested to know that her beau doesn't care much for her.
Surprisingly, she trusts him - distracting her may prove more difficult than expected.
We should break her trust - Geron's go-to lie is that her boyfriend is messing around with a younger girl, so we should set that up.
Well, we do know a girl that looks younger than the messenger. She seemed pretty eager to enter the bathhouse, too.
Talk to Nuri, and tell her to head into the bathhouse.
Yes, I'm sure the whole constantly-taking-advantage-of-Nuri's-good-nature won't have any consequences.
Anyway - now that we have proof, you can tell the messenger about her boyfriend's antics.
She's injured, and can't turn around.
If you had something reflective, the messenger could see the scene behind her without having to move at all.
Like something typically used to view reflections - remember, it doesn't need to be in perfect condition.
In the rubbish next to Jarre you'll find a cracked hand-mirror.
If it was fixed, it would do the job nicely. ?
Return to the bathhouse and fix the mirror with the repair ability.
The mirror is apparently too foggy to use - you'll need to find something that can wipe away the condensation.
The object you're looking for is something you've probably used to get condensation off your own mirrors, and can be found in the bathhouse.
Use the towel near one of the tubs to clean the mirror, then show it to the messenger to distract her.
She's well and truly distracted - with the letter pilfered, we can finally get onto the ship.