Harper agent kidnapped and interrogated by a Mind Flayer in the sewers.

Jaxxon's sister was killed by Zhents about 10 years ago. He joined the Harpers as a way to fight back.
 
Mistakenly captured by thugs looking for their own way into the Zhentarim. Interrogated by a Mind Flayer and rescued by The Mighty Sus.
 
The party spoke to Jaxxon after he woke up, and Maximillion even flirted with him. It would be a few days before a chance conversation with Volothamp Geddarm planted the seeds of suspicion in Maximillion.