Someone is stealing dogs in Gerddi Hwyan and Detective Sally Morris and her partner, Tej Williams, are in pursuit. But while the detectives chase their tails, Hels, a local taxi driver, is trying to please everyone. Unbeknown to the two women, there is a beast lurking in the streets. With the Day of Reckoning close by, there will be no escaping his deadly claws.

• 1: Ewin Chekhov
• 2: Dim Gwlad i Hen Ddynion
• 3: Dinistriwr
• 4: Nerf
• 5: Y Byrbs
• 6: Llech-heliwr
• 7: Y Slafdod
• 8: Ysbail
• 9: Nendwr
• 10: Niwl Coch
• 11: Milwr Bychan
• 12: Yr Un Gwyllt
• 13: Pentagram
• 14: Croesffyrdd
• 15: Bwci-bo
• 16: Ad-daliad
• 17: Cynllun Syml
• 18: Cipiad
• 19: Cariad, Yn Wir
• 20: Y Gwyliwr
• 21: Meysydd y Meirw
• 22: Cwmwl Tywyll
• 23: Mewn i’r Coed
• 24: Dydd y Farn
• 25: Helfa
• 26: Dyrchafael