| Brooke |
Bennett | Ellery's new classmate; Katrin's friend. |
| Jen |
Bishop | Student. |
| Jason |
Bowman | Science teacher at Echo Ridge High; deceased. |
| Viv |
Cantrell | Katrin's friend. |
| Ben |
Coates | Former mayor of Echo Ridge. |
| Mr. |
Coates | Scout troop leader. |
| Theo |
Coolidge | Katrin's boyfriend. |
| Ellery |
Corcoran | Protagonist. |
| Ezra |
Corcoran | Ellery's twin brother. |
| Nora |
Corcoran | Ellery and Ezra's grandmother. Aka: Nana. |
| Sadie |
Corcoran | Ellery and Ezra's mother. |
| Sarah |
Corcoran | Sadie's missing twin sister; Ellery and Ezra's aunt. |
| Deborah |
Creighton | Daisy's psychologist. |
| Meli |
Dinglasa | Journalist who graduated from Echo Ridge. |
| Coach |
Gagnon | Football coach. |
| Percy |
Gilpin | Ezra's classmate. |
| Kristi |
Kapoor | Student. |
| Declan |
Kelly | Lacey's boyfriend. |
| Malcolm |
Kelly | Declan's younger brother. |
| Caroline |
Kilduff | Melanie's daughter. |
| Dan |
Kilduff | Melanie's husband. |
| Julia |
Kilduff | Melanie's daughter. |
| Lacey |
Kilduff | Melanie's daughter; missing. |
| Melanie |
Kilduff | Nora's longtime family friend; nurse. |
| Daisy |
Kwon | Mia's sister; Lacey's best friend. |
| Mia |
Kwon | Daisy's sister; Malcolm's friend. |
| Mr. |
Kwon | Mia and Daisy's father. |
| Troy |
Latkins | Student. |
| Chad |
McNulty | Kyle's father; police officer investigating Lacey's murder. |
| Kyle |
McNulty | Theo's best friend. |
| Liz |
McNulty | Declan's ex-girlfriend; Chad's daughter. |
| Amy |
Nelson | Character mentioned. |
| Katrin |
Nillson | Malcolm's step-sister. |
| Peter |
Nillson | Katrin's father; Malcolm's stepfather. |
| Vance |
Puckett | One of Sadie's ex-boyfriends. |
| Gabriel |
Rodriguez | Ellery and Ezra's father. |
| Ryan |
Rodriguez | Police officer. |
| Andy |
| Airport receptionist. |
| Darren |
| Guy from the House of Horrors. |
| Lourdes |
| Ellery's friend. |
| Lynne |
| Kelly brothers' aunt. |
| Michael |
| Ezra's boyfriend. |
| Murph |
| Shauna's boss. |
| Shauna |
| Fright Farm makeup artist. |
