In February 2015, when Eddie Redmayne won the Best Actor Oscar for his portrayal of Stephen Hawking in "The Theory of Everything," it was the ultimate accolade for an actor who has thrilled audiences since bursting onto the scene a decade earlier. From indie stage productions to Hollywood blockbusters, he has shown himself capable of tackling a huge variety of roles while cultivating a huge and devoted fan following known as "Redmayniacs." This book...