Everything that follows is your now standard THIN MAN investigation, but it's still entertaining. There's snooping around in the dark, a large fight in a restaurant, a false story fed to the newspaper and other shenanigans. If you've made it this far into the series then you should watch this one also. It's nothing spectacular, but the mystery is good, there's some funny stuff and Donna Reed is beautiful.
Part 1 - The Thin Man
Part 2 - After the Thin Man
Part 3- Another Thin Man
Part 5 - The Thin Man Goes Home
Part 6 - Song of the Thin Man
Barry Nelson, who you might remember from THE SHINING. His office had the "impossible window".