We seem to be overwhelmed with Christmas murder mysteries this year - in this case in a puzzler-friendly format as Alexandra Benedict throws in a number of optional challenges for the reader, from spotting references to Fleetwood Mac songs (always a Christmassy activity) to Dickens novel anagrams in the text and a Christmas song puzzle in the chapter headings. If, like me, you just want to get on with the story, then there's a tangled web of relationships and past dark secrets to sort out in tracking down a series of murders that are accompanied by jigsaw puzzle pieces as clues. The murderer has devised these hints for the crossword-setting main character, Edie. The murder mystery itself is satisfying, and Benedict manages the build of clues and red herrings well. But I did have two problems. The lesser one is that Benedict's writing style can be a little uneven. There are some over-baked similes (think 'tree branches reached for them like the bony hands of hair-ruffling au...