In a plot with some similarities to the much better Camille, Greta Garbo is an artist's model who like the rest of her peers lives on the financial favors of those in the artist's colony. I wouldn't doubt she does those things professionally as well. It costs a lot to be an artist's Inspiration.
However she gets inspired by a young callow youth played by Robert Montgomery and she's willing to shake off all her patrons, chief among them being Lewis Stone for life with a young man entering France's diplomatic service. No matter because Lewis Stone seems rather enthralled with Karen Morley at the moment.
Probably Inspiration would not sit well with today's audiences. It's not one of Garbo's better vehicles.
One thing I did like about Inspiration was its torch song theme. Though it's not sung in Inspiration, the theme has lyrics and it's entitled How Long Will It Last. It was recorded by Bing Crosby the following year and was one of his early successes. It's the best thing about Inspiration.
I'd really recommend that you see this side by side Camille and judge for yourself how much better Camille is. Still Garbo and Montgomery do their best by this dated melodrama.