This was such a fun quick read. Cuckoos are birds that do not raise their own young. Instead, they lay eggs in other birds' nests. The natural mothering instinct causes these other birds to raise the baby cuckoos as one of their own. In this book, the small town of Midwich, England is disrupted by a 'Dayout', where all of the residents pass out for a day, not remembering anything. When they wake up, all of the women of child-bearing age are pregnant. The children born 9 months later, although human in form, are apparently an alien species that can exert mind control over anyone nearby. This book was a delightful, fun, and quick read.