Ashley Walters as Josh Buchanan in "Missing You."Netflix"Missing You" follows Kat Donovan whose fiancé, Josh Buchanan, disappears.She starts hunting for answers after she spots him on a dating app 11 years later.Her investigation also forces her to ask who murdered Clint Donovan, her father.Warning: Spoilers ahead for "Missing You."Netflix has kicked 2025 off strong with "Missing You," the latest thriller based on a Harlan Coben book.It follows the hugely successful Coben adaptation "Fool Me Once," which became one of Netflix's most-watched shows of all time in 2024.The new series revolves around Kat Donovan (Rosalind Eleazar), a detective who has never gotten over her fiancé, Josh Buchanan (Ashley Walters) disappearing without warning 11 years ago.He left shortly after her father Clint Donovan (Lenny Henry), a police inspector, was murdered.