The Secret Adversary (Tommy & Tuppence Mysteries)

Tommy and Tuppence are young, in love . . . and flat broke. Restless for excitement, they decide to embark on a daring business scheme: Young Adventurers Ltd. - "willing to do anything, go anywhere." But they get more than they bargained for when their first assignment for the sinister Mr. Whittington draws them into a diabolical conspiracy.

It isn’t long before they find themselves plunged into more danger than they ever could have imagined - a danger that could put an abrupt end to their business . . . and their lives.