Yr argraff mae Nain yn ei roi i bawb yw ei bod wedi drysu a cholli'i chof. Ond mae hi'n un o dîm Ditectifs Cudd Cymru - neiniau sy'n datrys troseddau gwaethaf Cymru. Rhedeg gwesty Trem-y-Môr wna Gwyn a'i fam a pwy feddyliai fod dihiryn yn aros yn y gwesty.
Granny gives the impression that she is confused and has lost her memory. But she is one of Wales's secret detectives grandmothers who solve some of Wales's worst crimes. Gwyn runs Trem-y-Môr hotel with his mother, and who would have thought that a scoundrel is staying at the hotel.
