| Angus | Barton | Farmer accused of raping Lorna McIntyre |
| Aggie | Blake | Jack's mother |
| Brendan | Blake | Jack's father, wheelchair-bound |
| Hilaria | Blake | Dead woman whose children Cormac found in 1993 |
| Jack | Blake | Aisling's partner, civil engineer |
| Maude | Blake | Jack's sister |
| | Clarke | Detective |
| Hannah | Collins | Sister of Tom Collins, drug addict in prison, police informant |
| Tom | Collins | Visited young Jack in the hospital in 1993, a defense lawyer in Galway in 2013, kept in touch with Maude |
| Aisling | Conroy | Physician, surgeon in training |
| Mary | Dooley | Physician, close friend of Aisling |
| | Dwyer | Detective |
| Peter | Fisher | Detective in Cormac's unit |
| Sgt. Melanie | Hackett | Danny's superior officer |
| Sgt. Anthony | Healy | Task force commander; rumored to be "shady" |
| Liam | Hearne | Retired detective; former instructor at police academy, worked pedophile cases |
| Sean | Hegerty | Detective with whom Cormac used to work |
| | Higgins | Detective |
| Maura | Hughes | Teenager who went missing in 1977; investigated by Cormac |
| Jim | Kavanaugh | Club owner accused of raping Lorna McIntyre, later arrested on drug charges |
| Domenica | Keane | Religious neighbor of Hilaria, Maude & Jack (1993), hired Maude to work at her farm |
| Timothy | Lanigan | Accused of murdering Maura Hughes |
| John | Lawton | Deceased owner of Australian cattle station, Maude's employer for 18 years |
| Danny | McIntyre | Detective with the garda & the task force |
| James & Anne | McIntyre | Danny & Lorna's parents |
| Lorna | McIntyre | Danny's sister, missing |
| Sarah | McIntyre | Danny's wife |
| Brian | Murphy | Superintendent of police |
| Trevor | Murphy | Assistant to Sgt. Healy, son of Superintendent |
| Mark, Fergus | Murray | Long-time friends of Jack |
| Sgt. Carrie | O'Halloran | Detective in domestic violence & vice squads |
| Caoimhe | O'Neill | Public health nurse caring for Domenica Keane |
| Cormac | Reilly | Rookie member of the garda (Irish police) |
| Cormac | Reilly | Now detective sergeant with National Drugs Unit task force at Mill Street Station, Galway |
| James | Rodgers | Detective in the garda |
| Simon | Schiller | Friend of Domenica Keane whom she proposed to take care of young Jack |
| Katherine | Shelley | Former social worker, called on the Blakes in 1990 |
| Emma | Sweeney | Cormac's partner, biology research scientist |
| Marcus | Tully | Police officer |
| Ceri | | Female garda |
| David | | Doctor, colleague of Aisling |
| Derek | | Mary's dentist boyfriend, band member |
| Jack | | Maude's younger brother, about 5 |
| Matt | | Cormac's friend in International Liaison |
| Maude | | 15-year-old girl whose mother has died |
| Saoirse | | Hannah's baby born while Hanna was in prison |
| Tara | | Dir. of Policy & Strategy, Child & Family Agency, Cormac's former girlfriend |
