This is the middle volume in an exciting series of three books in which a force from the 21st century is accidentally sent back in time to 1942 and throws the history World War two onto a completely different course.
I found the first two episodes in this trilogy so fascinating that when I learned that the final instalment had been published in Australia several months before the US and UK releases I could not wait, but had to order that one from Oz. None of the books in the series disappointed me.
The full "Axis of Time" trilogy is
Weapons of Choice
Designated Targets
Final Impact
In the first book, "Weapons of Choice" a multinational carrier battle fleet from the 21st century is accidentally sent back in time to 1942 when a scientific experiment goes wrong. They arrive in the middle of the US fleet which would have been about to win the battle of Midway, which immediately causes a major "friendly fire" incident; meanwhile the Japanese fleet which should have been sunk gets wind that something very odd is happening and escapes.
A different story in which a military unit was sent back to World War II might have given them a dilemma; should they intervene on the allied side, or try to minimise their impact in the hope of getting back through the wormhole to their own time without changing the past? Birmingham never gave his characters that option, as their arrival itself changed events beyond any hope of putting the timeline back in place. In this book his 21st century characters are struggling to make the best of the world they now find themselves in.
What happened at Midway was bad enough, although the the arrival on the Western side of a 21st century carrier battle group was more than enough compensation. But a second problem is that, while the great majority of the multinational force is thrown back as a unit and arrive together, one or two ships turn up in other parts of the world and are captured by bad guys so that some modern technology, and knowledge of the future which would have happened, fell into the hands of the Soviet Union, Imperial Japanese, and Nazis. Once they have overcome their disbelief, Stalin, Hitler, and Imperial Japanese alike resolve not to repeat the mistakes which in our timeline consigned them to the dustbin of history.
The men and women from the 21st Century face a continuing struggle both to adapt to the very different world they find themselves in, and to persuade the "temps" (short for contemporary) from their own side to accept such things as an African-American U.S. Marine colonel, and a Royal Navy Commander who is a half-asian woman. I would like to think that my parents and grandparents' generations would have treated members of the 21st century forces better than they are treated in this book: however, no doubt Mr Birmingham is right that some people would have treated them well and others very badly.
The treatment in this book of J Edgar Hoover, who is very prejudiced against the 21st century people and makes a real nuisance of himself, is quite entertaining.
Mr Birmingham takes the view that Japanese members of the multinational force, and other people in an anomalous position such as a 21st century Russian special forces officer, would regard the current rulers of their home countries as tyrants and put loyalty to their 21st century comrades before loyalty to country. However, the "temps" have great difficulty trusting Japanese and this is perhaps the worst of the many problems with the multinational force have in getting on with their new allies.
The action scenes in the book are very well done and make it almost impossible to put down; there is also some excellent use of humour. One of the members of the multinational force from the 21st Century is Prince Harry, who has become a Colonel in the S.A.S; throughout the trilogy there are some amusing lines and situations involving him.
None of the books in this trilogy are suitable for those of a squeamish disposition. Faced with Axis and Soviet powers who have become even more cruel and ruthless in their desperation to avoid defeat, the allies have to be almost equally brutal to defeat them. I can't remember reading a story in which the "good" guys kill so many millions of innocent people since E.E. "Doc" Smith's Lensman series. (More so even than in the real WW2, which is saying something.) Birmingham rarely goes for the easy answer and this is a series in which horrible things often happen to good people - and in which good people do horrible things.
Nevertheless, if you are into alternative history or war stories, and provided you are not squeamish, you will very probably enjoy the "Axis of Time" trilogy.