A bug-eyed but strangely endearing angel creature hands you the Aleph, asking you to protect it. It's not quite clear from whom or what you should do with it, but it IS quite clear that you should avoid the spectral stalkers, scary long-legged phantom creatures that arrive in short order to investigate the dead bug-eyed angel, at all cost.
The Aleph takes you on a random ride through dimensions, each of them a mini game world. You start at the library in limbo, have a talk with the dragon lady at the counter, grab some intel, and then it goes on: In short order, I ended up as a sacrifice for some cult of the undead, a literal pawn in the game of two god-like creatures in the sky, a customer on a pottery market recruited to save a master potter from his own golem, a specimen liberator aboard a space station, an unwelcome guest in a god's dream of a hunt, and several other things. I also had a memorable conversation with a scientist who tried to convince me that there's no such thing as magic.
Just as all of this starts to feel just a little bit to random, poof, I end up on the Ziggurat World, ruled over by the wizard Globus who may or may not be the big bad. I meet the mantir, very nice insect people who herd grazing insect bulls, the vaskind, lovely monstrous amphibians, and the significantly less lovely winged black shadows and ophidians and elegant and deadly silicate snakes.