"Set in 1931 Shanghai, Night Raid is the story of the Sakurai organization, a special military spy organization whose tale has been lost to history." -- iTunes Store
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The Sakurai organization is tasked with a covert mission to rescue a Japanese business president from the hands of a small Chinese military faction.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.