So, about three sessions ago, my "kill the dragon priest"

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So, about three sessions ago, my "kill the dragon priest" campaign has derailed, but in a fun way. My PCs vent from "smiting the evil guys" to "mafia tycoons". At this point, they own a gambling den, two caravan resting taverns and a small guild of scribes. With their last acquisition, however, when they integrated old Dueargar tribe into their operations to smuggle not-heroin to Northern kingdoms, they chewed off a bit more, then they might handle.

After they have killed initial mafia boss and owner of gambling den/caravan resupply points/scribe guild, they were left with former mafia boss henchman Simon who they now kept as their henchman. Now, Simon was an upstarty guy from the start and he connected with Duergars, willing to leave them entire PC operations and taking only all gold and silver of PCs he and Duergars together kill the PCs.

So, things are getting (possibly) rather dark for our PC crime syndicate.

I however, do not want to go full "hurr durr, you are poisoned&attacked by a bunch of assassins", but I'd like to present them with quite a few clues and warnings, give them a chance to prepare for incoming series of attacks, if they are perceptive.

What kind of things should I prepare for them to explain to them hostile takeover may be coming?

thanks