Gwenni Morgan is 12 and flies in her sleep.
One night she sees a body floating in a pool and wakes to find that Mr Evans has gone missing.
Gwenni starts her investigation of Mr Evans' disappearance by going round the village with a poster.
Gwenni is interviewed by the detectives investigating Mr Evans' death and an arrest is made.
The case is closed and Gwenni must put an end to her detective work, but not before a family secret comes to light.
Standing on the cusp of adolescence, Gwenni finds out the truth about her grandmother.