The quest for a lost gem. Though it's not much of a quest really, as the mystery of its location is already revealed in the very first scene, so if you are in the mood for some detective work, don't get your hopes up. Instead, this is more of a kidnapping/heist thriller, with some twists and turns along the way in an attempt to keep things interesting.
These attempts are largely successful, but I doubt they'll keep many people glued to their chairs. This is not a bad film, but it does struggle to rise above the pack. For that it relies too much on its narrative, which offers little more than what is expected from a film like this. It's never boring, but a little too safe.
The cinematography isn't too bad, but doesn't help to elevate the film, the soundtrack is fairly generic and fails to engage. The cast is overall decent, but apart from Sakurai nobody really stands out. It's one of those films that does a decent job all round, but never excels in anything. Just solid genre filler in other words.