Detective Jeff Evans and his family welcome a puppy to their home. Meira notices chalk marks by the garden gate, and it becomes obvious that someone is stealing dogs in the area. As Jeff delves deeper, he is drawn into the violent under-world of right-wing movements.

Mae'r Ditectif Jeff Evans a'r teulu, fel llawer iawn o deuluoedd eraill, wedi croesawu ci bach i'w cartref. Sylwa Meira ar farciau mewn sialc wrth giât y tŷ, a daw'n amlwg fod rhywun neu rywrai yn dwyn cŵn ar hyd a lled yr ardal. Wrth i Jeff ymchwilio'n ddyfnach mae'n cael ei dynnu i is-fyd treisgar mudiadau asgell dde.