Paul Helm 
Calvin: A Guide for the Perplexed [PDF ebook] 

John Calvin has been the subject of widespread misunderstanding and misinterpretation. He is a figure whom other theologians either seek to ‘capture’ to endorse their own, often very different, positions or whom they seek to vilify.
Calvin: A Guide for the Perplexed attempts to ‘re-situate’ Calvin by providing a mid-level introduction to his thought. As befits the series, special attention is given to Calvin”s thought, not on his character or career. The focus here is not only on Calvin”s theological positions, but also on the philosophy intertwined within them, the significance of which is often overlooked.