Accompanied by Myles, her assistance dog, Lilly sets off from Granny's house to explore. First she walks through the garden, then she visits the seashore. But when she comes to the big cave at the end of the beach her acute hearing means she is scared of the loud noise when she drops her torch. And what's that creature she can hear coming towards her?...

Mae Lilly, ynghyd â Myles, ei chi tywys, yn cychwyn ar antur o dŷ ei Mamgu. Mae'n cerdded trwy'r ardd yn gyntaf, cyn ymweld â glan y môr. Pan ddaw hi at geg ogof ym mhen pella'r traeth, mae ei chlyw craff yn peri iddi deimlo'n ofnus wrth iddi ollwng ei thorts. A beth yw'r creadur mae hi'n ei glywed yn dod tuag ati? ...