Wycliffe and the Four Jacks (1985) is a crime novel by Cornish writer W. J. Burley.[1]
The reclusive writer David Cleeve has been receiving mysterious warnings in the form of a single playing card; the Jack of Diamonds. When the card arrives torn in half one day, a murder is committed that same evening.
Holidaying in the local area, Wycliffe finds himself drawn into the investigation and soon uncovers a sinister tale of double murder, arson attacks and a whole host of other crimes reverberating down the years.