| Alexander |
Ambler | Brother of George Ambler |
| George |
Ambler | Egg broker in 1920s Yorkshire; deals in rare eggs |
| Tobias |
Ambler | Another brother of George Ambler |
| Jack |
Andrews | Reverend encountered |
| Matthew |
Barr | The egg thief in present timeline pursuing rare eggs |
| Mr. |
Bonnington | Meat seller referenced in storyline |
| Harry |
Chandler | Jim Chandler's son |
| James |
Chandler | Jim Chandler's son (1920s timeline) |
| Jim |
Chandler | Early-20th-century guillemot egg collector |
| Tom |
Chandler | James and Harry Chandler's brother in 1920s timeline |
| Christopher |
Connor | Expert on eggs from Natural History Museum. Aka: Chris |
| Mr. |
Constable | Landlord to the Sheppard family |
| Sally |
Constable | Mr. Constable's wife |
| Chubby |
Dawkins | Man associated with Hodgson group |
| John |
Du Pont | American millionaire referenced |
| Mr. |
Edwards | Ambler's right-hand man |
| Patrick |
Fort | Protagonist of the present timeline involved with stolen egg recovery |
| Sarah |
Fort | Patrick Fort's mother |
| Finn |
Garrett | Police officer involved in Matthew Barr's case |
| Malcolm |
Hodgson | Father of Pricky Hodgson |
| Pricky |
Hodgson | Anchor for the Chandlers |
| Mr. |
Hollingberry | Another egg broker in the historical timeline |
| Mr. |
Howells | Wealthy client in egg-collecting network |
| Mr. |
Minke | Client of Ambler in the egg trade |
| Jen |
Morgan | Nick Morgan's mother |
| Nick |
Morgan | Friend and neighbor of Patrick Fort; victim of burglary |
| Ty |
Newydd | Neighbor of Patrick Fort mentioned in the plot |
| Arthur |
Rickaby | The buyer of "Big Blue," a rare object |
| Celie |
Sheppard | Protagonist of the 1920s timeline who finds a rare red egg |
| Enid |
Sheppard | Celie Sheppard's mother |
| John |
Sheppard | Celie Sheppard's father |
| Martin |
Sheppard | Celie Sheppard's brother |
| Molly |
Sheppard | Celie Sheppard's daughter |
| Stanley |
Sheppard | Celie Sheppard's brother |
| Tom |
Sheppard | Celie Sheppard's brother |
| William |
Slack | Man entrusted with Ambler's jewel |
| Alan |
Sweet | RSPB nest guardian |
| Lynne |
Sweet | Alan Sweet's wife |
| Arthur |
Taylor | Sergeant major. Aka: Wink |
| Dr. |
Wardlow | Doctor who treated an injured character's wrist |
| Mr. |
Worrell | One of the egg brokers in the historical storyline |
| Angie |
| Patrick Fort's coworker |
| Arthur |
| Member of the Chandler group linked to egg collecting |
| Bronwyn |
| Patrick Fort's coworker |
| Ceri |
| Clerk supporting investigations |
| Ellen |
| Assistant to Christopher Connor |
| Farrell |
| Nick Morgan's grandmother |
| Francis |
| Character tied to historical subplot |
| Fred |
| Eagle at RSPB |
| Giles |
| Enid Sheppard's brother |
| Ginger |
| Another eagle at RSPB |
| Kev |
| Patrick Fort's coworker |
| Kipper |
| Another member of the Chandler group |
| Meg |
| Friend of Patrick and Nick |
| Patch |
| Robert's dog |
| Philip |
| Ceri's boss |
| Rhys |
| Patrick Fort's coworker |
| Robert |
| Laborer who helps Celie retrieve eggs; caregiver figure |
| Coughlan |
| Finn Garrett's law enforcement colleague |
| Martha |
| Ambler's maid |
| Philip |
| Martha's son |
