It's world war 2, and a blind detective follows unseen clues to solve a murder and undermine a German spy plot.

'Thrilling and perilous adventures' NEW YORK TIMES

Captain Duncan Maclain was blinded during his service in the first World War. Now he is one of New York City's most sought-after detectives, achieving a mastery of the subtle unseen clues often missed by those who see only with their eyes.

Now, with the outbreak of a second world war, Maclain is pulled into a case unlike any he's investigated before. Aided by his dogs Schnucke and Driest, the Captain puts the intelligence-gathering techniques he learned in the Army to work on a case involving German spies, where it is almost impossible to tell whose side anyone is on.