Paul Helm has offered a one-of-a-kind work of scholarship in this book. It is one of the *very* few books that provides an in-depth treatment of John Calvin's ideas in light of contemporary analytic philosophy and philosophical theology. It is an undertaking on par with Eleanore Stump's treatment of St. Thomas in her book "Aquinas".
Calvin is mostly known for his views on predestination, but Helm does him a service by bringing to light Calvin's views on a variety of other topics (for those who are concerned, there is still a chapter on free will). And while Calvin did not often address the writings of other philosophers head-on, Helm points out many instances where Calvin has been influenced by philosophers and theologians, both ancient and contemporary to Calvin.
Helm also gives a critical analysis of contemporary scholarship that relates to Calvin, primarily in what has come to be known as "Reformed Epistemology" headed up by Alvin Plantinga and Nicholas Wolterstorff. His treatment of such topics is spread throughout the book, being addressed in light of the current topic being discussed. For example, in the discussion of epistemology, Helm argues that Calvin should be understood as a sort of evidentialist as opposed to what Reformed epistemologists have attributed to him. Likewise, he offers a compatibilist reading of Calvin on free will, in contrast with the sometimes 'hard determinist' interpretation when it comes to the contemporary debate over free will.
This book is a goldmine for students of philosophy, theology, and John Calvin. The price is a little hefty, but it can be justified considering there is really nothing else out there that even comes close to dealing with these topics the way Helm does.