I've just released my latest solo adventure for Tunnels & Trolls called Thornguard, set in the capital city of Peakvale. This one's a little different than usual since there isn't an over-arching quest; rather, you get to do what you want!
In Thornguard you can join guilds, get jobs and head out on randomly generated quests. With the Job Board system, you can choose to fight crime as a city guard, or take part in crime as a member of the Thieves Guild. You can also become a merchant or holy person if you fancy. It's all up to you.
This solo uses a keyword system, like in Fabled Lands, meaning your actions have consequences. If you're caught stealing and murdering, there's a chance you could end up in jail or even executed!