Seven year secret

the long version

> Aylwin was reasonably contented with a life devoted to work and her small son, Johnny, till she met the attractive Keith Marsden and the anonymous letters started to come. Who is sending them? Can their message possibly be true and her husband, Roy, believed drowned seven years ago, be still alive? One mysterious and frightening happening follows another. Then, after a terrifying ordeal in Roy's old house, Aylwin discovers that the path to the truth leads her to the track of a murderer.