Donald Harstad is one of the rare writers whose basic good humor shines through his work while managing not to inflict himself on the material. This is no small accomplishment, and I believe that this man is a natural. His writing is never labored; he has a splendid gift for narrative flow and for creating likeable, believable characters.The Big Thaw starts out with the mystery of who murdered two young burglars and spreads to a far larger scenario with critical international implications. Harstad actually makes us feel the miserable cold of the Iowa winter while creating a very real sense of the territory he knows so well. The climax of this tale, set on a riverboat gambling casino, is beautifully executed, causing the reader to wonder every step of the way how this impossible situation will be resolved. As it turns out, it is done with great imagination and at a pace that leaves one fairly winded.My only quibble, and it's a small one, is the author's fondness for grins. Every last character grins. Occasionally somebody smiles, but mostly, grinning rules the day. However, the editor, more than the author, is to blame for failing not only to pick up on some spelling errors but also this (admittedly minor) repetition. It certainly doesn't detract from the story or from Mr. Harstad's considerable talent, but he deserves to have his work treated with more care. I recommend this series enthusiastically.