Shaun's dad made it out of the vault, and he met Piper and Nick but on the way back to Diamond City, Shaun's dad, Piper, and Dogmeat encountered a Super Mutant Behemoth. Only two of them got away alive while one stayed behind. That is where our story begins... This is a what if story about the companions from Fallout 4 trying to find Shaun without the player charater. I'm not sure if it'll include DLC companions yet, but we'll see.