A Blizzard of Polar Bears by Alice Henderson

Wildlife biologist Alex Carter is thrilled with her new assignment: studying polar bears in Churchill, Manitoba. After a few successful days of gathering data, Alex's research and samples are stolen. Then, while off exploring one day, Alex finds a dead body. She wonders what's going on and wishes she could spend her time doing research that will hopefully help protect the polar bears, but it's soon clear that Alex has mistakenly gotten involved in something that threatens her life. A Blizzard of Polar Bears is the second book in the Alex Carter series and, in addition to the mystery, offers loads of interesting details about polar bears.