This side of murder
(Book)

"The Great War is over, but one young widow discovers the real intrigue has only just begun.England, 1919. Verity Kent's grief over the loss of her husband pierces anew when she receives a cryptic letter suggesting her beloved Sidney may have committed treason before his untimely death. Determined to dull her pain with revelry, Verity's first impulse is to dismiss the derogatory claim. But the mystery sender knows too much--including the fact that during the war Verity worked for the Secret Service, something not even Sidney knew.Lured to Umbersea Island to attend the engagement party of one of Sidney's fellow officers, Verity mingles among the men her husband once fought beside and discovers dark secrets--along with a murder clearly meant to conceal them. Relying on little more than a coded letter, the help of a dashing stranger, and her own sharp instincts, Verity is forced down a path she never imagined and comes face-to-face with the shattering possibility that her husband may not have been the man she thought he was. It's a truth that could set her free--or draw her ever deeper into his deception." --,(Source of summary not specified)