Death in Paradise, Season 6

DI Humphrey Goodman is eagerly awaiting the return of Martha, an old acquaintance from London. But as soon as she arrives on the island, their burgeoning romance is put to the test by an untimely murder. From a cricket club president murdered in the middle of the pitch, to a scientist found dead halfway up a volcano, there are more fiendishly difficult puzzles for the team to tackle.