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 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 not want to share with her daughters.