A thrilling detective novel set in the imaginary town of Gerddi Hwyan, near Cardiff. After having a lift by Mr Blaidd to do a night's work, a young prostitute's life suddenly comes to an end. Her twin sister comes to investigate, and in her quest to find the murderer, she comes across the corrupt policemen, a prospective lover and many other interesting and fictional characters.

Nofel dditectif gyffrous wedi'i lleoli yn nhref ddychmygol Gerddi Hwyan, ger Caerdydd. Ar ôl cael ei hebrwng am noson o waith gan Mr Blaidd daw diwedd sydyn i fywyd putain ifanc yn y dref. Wrth i'w hefaill ddod draw i ymchwilio i'r dirgelwch daw i adnabod yr heddlu llwgr, darpar gariad a nifer o gymeriadau rhyfeddol a chwedlonol eraill sy'n ei harwain at y llofrudd.