Can't really add too much to what others have said. Although it was a real treat to have a female protagonist (who happens to be gay and of color, no less!), and to have other women in strong supporting roles, I felt oddly detached from all of the characters. Maybe if we had learned more about Anika's background or history, it would have meant more when she was in peril--not sure.
Other pluses: the Arctic setting, which the author DID do a great job of portraying, and the possible geopolitical consequences of the polar icecaps melting. Well done. Minor nitpicks: typos here and there, and Roo's inconsistent patois.
I'd recommend this one for a beach or airplane trip. It's fairly enjoyable while reading, but I'm not sure it will stick with me now that I'm done.