Just finished
How to Rig an Election by Nic Cheeseman and Brian Klaas.
Each chapter looks at a different way to get to the result you want, from gerrymandering the boundaries to stuffing ballots to being helpful to major powers in other ways, and is filled with modern examples from across the world. The most interesting point of the book, and the question it tries to explain, is why autocrats go to such lengths to do this, and why they tend to last longer than those who don't.
Unlike most other comparative studies, it doesn't bombard you with statistics preferring to use qualitative data derived from the authors' own field work, and is not a dry read. I'm just slightly scared that these techniques are on the increase across the world.