England, 1926. After a wealthy industrialist is found dead on a treasure hunt with the Bright Young People of London, the renowned detective Lord Edgington and his loyal grandson Christopher suspect foul play and sign up for the next speedy chase across the city. When a second body is found, shot through the heart in the centre of Westminster, the mismatched duo set off on the trail of a killer.

One victim is old and rich, the other young and poor, but could the jazz-and-drink-fuelled parties of the infamous Gargoyle Club link the apparently unrelated figures? Greed, espionage, wartime valour, aristocrats and bohemians come crashing together in Lord Edgington's most mind-boggling case yet. Will you be able to unravel "The Tangled Treasure Trail" before the seasoned detectives?

An Agatha Christie-style mystery with a dash of Downton, an array of speeding cars, and the most lovable golden retriever in crime fiction along for the ride, the fifth entry in the bestselling series of classic whodunnits is filled with twists and surprises from the first page to the last.