If you and your child are an Astrosaur fan you will have no problem enjoying this book. Read the Amazon review above - it describes the book very well. Cows from our time have just been bred for high intelligence, and bright bull Prof. McMoo uses discarded rubbish from the human scientist next door to convert the cow shed into a time machine. Using his technology, in the 26th century mad cows from the F.B.I (Fed-up Bulls Institute) build the fearsome ter-moo-nators, part cyborg part bovine killing machines, and send them back into time to try to destroy human history. Only the Cows-In-Action (CIA) can save the future by preserving the past. Lots of good Sci-Fi and clever childish Moo related jokes abound to amuse any kid under 12, although boys might go for this book a bit more readily than girls. This must be the first book in the C.I.A. series, so I would read it first.
Perhaps the book isn't quite as polished as the excellent Astrosaurs series of books and I find I stumble on the cow names McMoo and Bo when reading it out loud to my son (11) - a poor reader, but there's no denying it was a fun easy read with a lot of good line drawings to set the mood as well. There's also 4 collector cards inside to cut out. The books got 147 pages of large text and most 8+ children will be able to read it themselves with a little adult help. The book is mildly tense, quite funny, and not scary. We now have the next two Cows-in-action books on order. So recommended (I should have given the book 5 stars really). Do also try the Astrosaurs & Captain Underpants series of books as well, they are very preteen boy friendly.