Searxng/Maigret PBS Masterpiece t TV In 2026, PBS Masterpiece bids farewell to Grantchester & The Marble Hall Murders, but renews Maigret. Discover the changing lineup of British mysteries. April 17, 2026 AceShowbiz - In 2026, PBS Masterpiece will see a notable shift in its lineup of British mystery dramas as two long-running favorites prepare to conclude, while a fresh detective series gains new momentum.