SS-GB, an alternate history novel by Len Deighton, takes place a year after Great Britain capitulates to Nazi Germany. As an alternate history genre book, this work is of high quality. Deighton has a precise and controlled prose; his powers of observation and description are high.
This book is also a mystery novel, so it follows the conventions of that genre. Not a big fan myself; these novels always feel compressed and forced at the conclusion (as does this novel). But overall this novel is expertly wrought and masterfully written.