Say the year is around 1930. The USSR is not yet threatened by any other power, and it hasn’t been such a long time since Stalin came to power. Comrade Stalin suddenly gets a heart attack. Or maybe he decides to overcome his fear of flying only to end up dying in a plane crash. Who knows. What will the post-Stalin leadership look like, in that case? Who is the likeliest candidate to become general secretary? What are some of the immediate policy changes we can expect in 1930? And does Trotsky fit into any of this?