Frozen Solid by James M. Tabor

An unusual mystery set in the Antarctic.  An enjoyable read, but both characters and plot stretch credulity.  The heroine and reluctant detective, Hallie Leland, is a scientist/diver, sent to replace a scientist who recently died mysteriously, and who had discovered an unusual new life form in an underground lake.  While the harsh environment is aptly portrayed, the heroine has too many lucky escapes to be believable.  Supporting characters are not much more than stereotypes.  The plot does have some unusual twists and turns for fun.  316 pages.