This is a Cock Robin Mystery introducing Trygve Yamamura – judo expert, Samurai sword connoisseur and private detective – triple threat to San Francisco crime. These combined skills enable him to keep his own head attached while finding out who removed someone else's with honorable Japaneses weapon. This is a good old-fashioned detective story, a genuine whodunit, with a good deal of suspense thrown in.
Poul Anderson (1926–2001) was born in Pennsylvania of Scandinavian stock. He started publishing science fiction in 1947 and became one the great figures in the genre, serving as President of the Science Fiction Writers of America, winning many Hugo and Nebula awards, and also winning the Gandalf (Grand Master) Award.