"Nemesis" -- Miss Marple is invited by an old friend to investigate a crime, though she's not told what the crime is or where it took place.
"Sleeping Murder" -- Miss Marple helps a young New Zealand couple unravel a mystery, learning how a killer kept his murder "sleeping" for years.
"At Bertram's Hotel" -- Miss Marple solves the mystery of the murder of a peculiar doorman.