This collection offers three novels of adventure and suspense from Patricia Wentworth, each with its own plucky and independent young heroine.First, Jane Smith is incognito at stately Luttrell Marches, in the middle of a mystery of secret formulae, political plots, and secret passages.Then, Sally Meredith is entrusted with the red lacquer case containing the formula for her uncle's new and deadly gas, and is soon in the clutches of sinister foreign agents.And finally, hard-up dressmaker's assistant Chloe Dane inherits her family's ancestral home, and finds herself locked in a struggle with unscrupulous opponents for the sinister content of her late uncle's safe.