Not to nick-pick, but Delera's chain is entirely solo-able.
I run it solo with every new toon as it gives decent XP along with nice loot.
Part 2 has an optional that requires some multi-player coordination, but that's all.
A hand full of others can also be considered 'non-solo-able' for all intents and purposes although some
could be done with gold seal hirelings, petrifying mobs /partial turning undead to stand on triggers and other extreme tricks. Necropolis 1
Tomb of the Burning Heart comes to mind.
I only mention this because the OP mentioned skulking around and to me, getting into a place that people claim requires 4 people up to a full party and coming out not only successful but with an Insidious Bonus is the embodiment of rogue.
Ok, two reasons. The other is that Delera's is ounce for ounce one of the best low level packs to save your TP's for IMO and that's true for solo as well as group. I always recommend it.
Rogue is a very competent solo class with several options (stealth vs power).
See some old but just as valid
Ubiquitous Shadowmage techniques
Rogue Assassin
Solo'ing Sins Elite
Properly geared / built / played, they are potent both in and out of the shadows.