Lea, F. A.  The Tragic Philosopher.  New York: Athlone Press, 2001.

From the Publisher:

“This classic account of Nietzsche’s thought, first published in 1957, is now available in paperback. It traces the development of Nietzsche’s thought through all its principal phases, and stresses its relevance to our times. Squarely based on original literary and biographical sources, it avoids technicalities and obscure comparison. It is intended for the general reader rather than the specialist – above all for the reader who desires, as Nietzsche did, to “clear his mind of cant”.”

Online:
Amazon