Never read a Sophie Hannah before and therefore had no background information about Proust of the Culver Valley CID and not the French novel and Charlie, Sam and Simon of the same outfit. Must dip into the previous books to bone up on them and get to grips with their in-fighting, tensions and dark secrets. I love the title of this book and feel that readers in the US have been deprived of its beauty and poetry - their version is The Cradle in the Grave which, to my mind, is dull and obvious by comparison. 
 I read most of this book in one day and it was an enormous pleasure. Wickedly stayed in a hotel room and read-for-Australia. Next day, frightful backache - insufficient exercise. Own fault. Took husband's strong pain-killers. Bad reaction. Ok after 5 hours of extreme discomfort and disorientation. Conclusion: Never take someone else's pills and exercise (or at least get up) between chapters. 
 Recommend Fleur Fisher's review my link text who seems to have suffered sleepless nights from this same book. 
 Maybe A Room Swept White is a health hazard as well as being an engrossing novel.