Cases to baffle and intrigue. What to expect from BBC Radio 4 and 4 Extra’s treasure trove of murder mysteries. Available only on BBC Sounds.

In this special preview of the BBC Radio 4 series Opening Lines, John Yorke looks at Patrick Hamilton’s 1938 stage play Gaslight. To hear more episodes from the series, just search for Opening Lines on BBC Sounds. A big hit on London’s Shaftesbury Avenue and an even bigger success on Broadway,...