In the SciFi adventure series dubbed "Seeds Of Civilization," a Seattle aerospace engineer and his team investigate several of archeology's real unsolved mysteries and get closer to the truth-one that is truly "out of this world!" In this sequel to Tractrix, author R.J. Archer delves into the secrets of the Yonaguni Monument off southern Japan.

Tsubute: In the maiden voyage of the team's newly acquired Learjet, the NWIDI adventurers travel to southern Japan to investigate an underwater pyramid off the coast of Yonaguni. After a dramatic landing in the Aleutian Islands of Alaska and a run-in with Department of Justice agents in Tokyo, they finally reach Yonaguni and soon find themselves involved in a case of murder and international kidnapping. In an effort to solve the murder and clear their own names, they uncover a dark secret hidden on the tiny island for more than 10,000 years.

"Settle in and fasten your seat belt. You're about to take off on an adventure of action and international intrigue. Your host, R. J. Archer, will be your diving guide and your local expert on Japanese culture. His pulse-pounding plot suggests an island's incredible secret. Most amazing of all, this tale is based on a real island and stunning recent archeological findings." Richard Jones, feature writer for El Hispanic News, Portland, OR

"The long anticipated sequel to Tractrix is finally here, and once again, RJ Archer lays a foundation of rich detail that subtly builds into a runaway train of action, treachery and discovery. Tractrix offered a glimpse at a vision of history ignored by contemporary scholars; Tsubute rips down the curtain and sets it on fire." Sean Ellis, author of Magic Mirror and The Clive Cussler Code

The team from NWIDI is at it again This time, a trip to southern Japan to investigate a mysterious underwater pyramid off the coast of Yonaguni Island involves the four friends in a case of murder and international kidnapping. The maiden voyage of the team's newly acquired Learjet begins with a dramatic landing in Alaska's Aleutian Islands and, after a run-in with the Department of Justice in Tokyo, the team begins to think they should never have left home. When they finally touch down on Yonaguni, a Japanese-American exchange student befriends them and helps them get to know the tiny island of 1,200 people - and the dark secret being protected there. A tsubute discovered outside the NWIDI headquarters in Seattle reappears on Yonaguni and leads the team to a startling discovery about the true nature of the island and its original inhabitants. A tsubute is an ancient Ninja throwing weapon.]