Where Did All The Flowers Come From?

Based on the island of Arran. Sister Rhona, Vicky and Mary meet to mark the occasion of their mother's burial, a year to the day following her funeral.  Puzzled by the many flowers left on their mother's grave, they start to probe the reasons for this and who is responsible. Hatching a plan to catch the donor, the answer leads to some unexpected revelations that their mother did want to share with her daughters.