The hybrid mystery — typically, though not always, a blend of clue-gathering detection and pulse-racing thrills — is a tricky proposition, since it often smashes together two styles of writing and plotting that don’t make the most comfortable of bedfellows.  The best example, to my mind, is John Dickson Carr’s underappreciated masterpiece The Punch and Judy Murders, a.k.a. The Magic Lantern Murders (1936), published under his Carter Dickson nom de plume, which solves this oft-discordant clash by keeping  the breathless chases to its first three-quarters before revealing itself as a cannily-clued mystery in the closing stages.