- The Guardian: Says Stephen Graham’s chilling Jurek Walter rescues the thriller whenever its supporting characters feel underdeveloped, criticising the show for leaving the victims’ suffering unexplored as the mystery grows increasingly hollow.
- Los Angeles Times: Finds the story inside the psychiatric hospital melodramatic and implausible in places, but praises Liev Schreiber’s restrained performance as a grief-stricken detective.
- RogerEbert.com: Praises the tense cat-and-mouse plot and Zazie Beetz’s performance as an undercover cop, while comparing the premise to The Silence of the Lambs.
- The A.V. Club: Applauds Graham’s unnerving mannerisms and the claustrophobic hospital setting, highlighting the scene in which Walter manipulates a neighbouring inmate into violently harming himself, while praising the show’s exploration of grief and parenthood.
- Radio Times: Awards the series two stars out of five, arguing that its multiple timelines and traumatic backstories “get in each other’s way”.
