Invictum

A perfectly coded vault, a masterful puzzle solver, a ruthless psychopath – and only one can win. The renowned puzzle genius Mike Brink is personally invited by the Japanese Emperor to come to Tokyo and participate in the grand competition to solve the legendary Dragon Puzzle Box. What it contains is a mystery, but it is certainly of immeasurable value. No sooner has the competition begun than an old adversary unexpectedly appears, forcing Mike into a complicated treasure hunt across Japan – and a difficult decision where not less than the future of the country, if not the whole of humanity, is at stake.