56 Days is an American thriller television series developed by Karyn Usher and Lisa Zwerling for Amazon Prime Video. Based on Catherine Ryan Howard's 2022 novel of the same name, and executive produced by James Wan, the series stars Avan Jogia, Dove Cameron, Karla Souza, and Dorian Crossmond Missick. It alternates between two timelines, following Oliver and Ciara's relationship after meeting in a supermarket, and 56 days later, when a corpse is found in their apartment with two detectives trying to uncover what happened.
The series premiered on Amazon Prime Video on February 18, 2026.
Oliver Kennedy (Avan Jogia) and Ciara Wyse (Dove Cameron) start an intense relationship after meeting in a supermarket but police fear it has ended in murder after an unidentifiable body is found.
The series is produced by Amazon MGM Studios and Atomic Monster and was commissioned in December 2023. The series is written and executive-produced by Lisa Zwerling and Karyn Usher. James Wan is one of the executive producers, along with Michael Clear and Rob Hackett at Atomic Monster. Nathan Barr composed the score for the series. Multiples changes where made for the series, with the setting from the novel changed from Dublin to Boston. The other major change is that the novel takes place during the COVID-19 pandemic, with Oliver suggesting that Ciara spend the lockdown at his place; however, the pandemic's storyline was removed for the adaptation.
In May 2024, Dove Cameron and Avan Jogia were cast in the lead roles of Ciara Wyse and Oliver Kennedy. In June 2024, Megan Peta Hill, Dorian Crossmond Missick, Karla Souza, Patch Darragh, Kira Guloien, Celeste Oliva, Jesse James Keitel, and Matt Murray joined the cast.
Filming took place in Montreal in June 2024.
56 Days premiered on February 18, 2026, on Amazon Prime Video, with all eight episodes released at once.
On the review aggregator website Rotten Tomatoes, the series holds an approval rating of 62% based on 29 reviews. The website's critics consensus reads, "56 Days almost overstays its welcome with this snoozy mystery, but its central conceit is saved by two utterly beguiling performances." Metacritic, which uses a weighted average, gave it a score of 55 out of 100 based on 11 critics, indicating "mixed or average" reviews.