In Circular Time, Paul Cornell and Mike Maddox take the Fifth Doctor and Nyssa through four separate half-hour adventures. While I couldn't declare this to be the best ever Big Finish release, it is certainly among the very good ones. The first of the four, "Spring", is the weakest, a story of renegade time-lords and bird people that gets a bit confused. But then we are into "Summer", a confrontation with Sir Isaac Newton in the Tower of London due to the Doctor pulling out the wrong coins, which is rather fun. The best of the four is "Autumn", which is a rather pastoral account of Nyssa's romance while the Doctor enjoys playing cricket. And that then feeds into the last of the four, "Winter", set long after the Doctor and Nyssa have parted company, but with Nyssa having these very strange dreams... ( )