In this movie Bacall's character befriends Bogart who has escaped from jail. In classic film noir manner, she believes his stories without question. Bogart wants to solve the crime so he can be set free. The strange part is that we don't see Bogart in the first part of the movie but only hear his voice, because one of the things he does is have plastic surgery so he will not be recognized. Not my favorite B&B movie, but still lots of fun.
This classic is one of my favorites. If you buy the DVD you will get the original version which is very different from the final release. The final cut is much better but the first version explains a lot of stuff that is left in HUH??? mode in the release version. The movie has everything, the rich socialites, the sordid affairs, the sultry dames and Bogart as the cynical but honorable detective. You must see this.