The Heart of a Mystery - L. T. Meade

The Heart of Mystery by L. T. Meade and Robert Eustace was published in 1901 in six installments in the Windsor Magazine, Vol. 14. The stories relate the adventures of a young Englishman summoned to the deathbed of an old friend in Paris who subsequently finds himself embroiled in a web of danger, espionage and intrigue. - Summary by J. M. Smallheer