Yesterday I finished Escape From Amsterdam by Barrie Sherwood.

Surprisingly, the book doesn't take place in Europe. Instead, it's set in Japan and the titular "Amsterdam" is a theme park. The protagonists sister is a performer there, and is also being kept there by a senior Yakuza. At the same time, he needs to get her out to help him get some money to pay back some gambling debts before his legs (or other parts) get broken.

The portrayal of Japanese youth culture from someone who lived there for many years - even though not an insider himself. The characters are well drawn, if not exactly sympathetic, and the plot avoids most of the obvious cliches.