“Miss Marple: A Pocket Full of Rye” (9 p.m., PBS): In “Miss Marple: A Pocket Full

“Miss Marple: A Pocket Full of Rye” (9 p.m., PBS): In “Miss Marple: A Pocket Full of Rye,” Julia McKenzie takes on the role of Agatha Christie’s spinster sleuth for a new “Masterpiece Mystery!” series. This time our heroine is snooping into a trio of murders that seem to mimic a nursery rhyme.

“Expedition Africa” (10 p.m., History Channel): Trouble brews as one team member contracts malaria and two others engage in a heated argument. Sounds like a swell time for a rest stop.