Diff James and Holly Wilson investigate the mystery of a plane crash in which the plane does not appear at the crash scene until two days later, and it is found with its pilot shot in the back of the head.
Annie Kelty finds herself in a world of danger on the way to deliver a valuable goblet to a buyer at Castle Roy in the Scottish Highlands, not the least of which is the mysterious thing that capsizes her boat in the middle of Loch Roy.
Dave Barrio and his friend Annie investigate the deaths of rich old Mrs. Miller and her son Bob, and there are plenty of suspects with lots of reasons for wanting the family cash.