I only did two challenges last year and one of them has now been completed - the What's In A Name 2018 challenge which was hosted by The Worm Hole.
I read all six books required and these are they:
The word ‘the’ used twice. THE Lost Book of THE Grail by Charlie Lovett
A fruit or vegetable. The OLIVE Tree by Carol Drinkwater
A shape. The Cheltenham SQUARE Murder by John Bude
A Title that begins with Z (can be after ‘The’ or ‘A’) The Z Murders by J. Jefferson Farjeon.
A nationality. A SWISS Vendetta by Tracee de Hahn
A season. Absent in the SPRING by Mary Westmacott
This was a really fun challenge and many thanks to The Worm Hole for hosting.