A London detective from the 18th hundreds a detective is trying to track down a crime family who's weak, because for the last 5 years they've been fighting against themselves.

1st mission you change into a mouse and sneak along the gutter to watch the main gang leader steal an expensive red sports car he gets in and starts driving away so you change into a pigeon and fly after him.

you find he's got an operation scraping expensive cars and you manage to get near the car that was stolen in time by changing into a beaver and hiding in a tree the bad guy is looking for something in the glove box of the car.

Cutscene you change back to a human (maybe there's a timelimit for shifts) in the tree the bad guy see's you and drives into his gate smashing it down and wrecking the car before getting into a gang members car and escaping.

This is simplified from my dream slightly to make sure I got it all down before I forgot.