The Poison Puzzle: An utterly addictive historical mystery

London, 1889. When Emma Langley discovers a mysterious symbol in her late husband's diary, she uncovers a connection to a secretive treasure-hunting group with powerful members. Her investigation takes an unexpected turn when Lord Charles Harpole, a society member, is found dying in his hotel room.

The authorities rule it suicide, but Emma and her friend Penny Green aren't convinced. As they follow a trail of cryptic clues leading...