Polarpol
Polarpol is the world's first Polar Police Task Force - think Interpol in the Arctic - staffed with police officers recruited from each of the eight Arctic nations: Alaska (USA), Canada, Finland, Greenland (Denmark), Iceland, Norway, Russia, and Sweden.
The Polarpol books are typically action-driven, with plenty of shootouts and chases, combined with a little political intrigue, and shadowy criminal organisations to boot.
Several characters from other series, such as Sergeant Petra 'Piitalaat' Jensen, join the Polarpol team at various stages.
There are nine books planned in this series.