And for me...the Letter A stands for: A Sprig of Sea Lavender by J. R. L. Anderson (Click title for my review). As I mention in the review, this book has been a kind of Holy Grail book for a long time. I don't remember when I first put it on the TBF/O (To Be Found/Owned) list--sometime in the 80s. I found it listed in The Mystery Lover's Companion by Art Bourgeau and something about his synopsis grabbed me and held on tight:
Piet Deventer of Scotland Yard investigates the murder of a young woman found dead on a train, with a fortune in artworks in a portfolio next to her. The only clue is a sprig of sea lavender. the trail leads to the seaside in an excellent read.