This book recently was recently published (Nov. 14, 2023) and is the story of Japanese loyalty and spying before and during the attack on Pearl Harbor. It was written by Mark Harmon of the NCIS series on tv and Leon Carroll, Jr., who is a retired NCIS agent and technical advisor for the NCIS television programs.

In this book the overwhelming majority of Japanese citizens in Hawaii are shown to be very loyal to the USA and the real spies are those from Japan who are working at the Japanese consulate. The confusion and lack of clear communication between the various US Intelligence Serices who are trying to monitor the situation and assess danger is noted and explained. For example while several agencies are monitoring the telephone lines when one quits the others might not be notified. And, when coded messages are received the messages have to be sent to another area for decoding thus delaying the information. The fact that the Consul is burning important papers before the attack is revealed when someone is listening in on a conversation on a telephone line used by the cooks at the Consulate-- a line that isn't normally tapped.

Douglas Wada is a young Hawaiian man who is sent to Japan to learn the culture of Japan. This was a common practice then. He learned the language and culture and notes that young people in Japan are being drafted into the Japanese armed forces abruptly and whether they are citizens or not didn't really matter so he decided to leave the country. He had to avoid the Japanese authorities to do so or he would have been conscripted. He is a real hero in the story and is the first agent of what would become NCIS who is of Japanese ancestry.

It's a very interesting book of Pearl Harbor attack information and of the Japanese spy and an American spy hunter.
Also, it does follow the main characters through and after the war. The attack on Pearl Harbor is described as to how the main characters experienced it.

Well worth reading.

Retired cat herder.