Tommy and Tuppence Beresford mysteries

"The Great War is over and jobs are scarce. Tommy Beresford and Prudence "Tuppence" Cowley, who were friends before the war, run into each other in London and discover they are both equally short of money and opportunities. On a whim, they decide to start a business, advertising themselves as "The Young Adventurers." Their first job leads them into a series of increasingly dangerous situations involving international spies, a society beauty, a Russian...

"It is World War II, and while the RAF struggles to keep the Luftwaffe at bay, Britain faces an even more sinister threat from 'the enemy within'--Nazis posing as ordinary citizens. With pressure mounting, the intelligence service appoints two unlikely spies, Tommy and Tuppence Beresford. Their mission: to seek out a man and a woman from among the colorful guests at Sans Souci, a seaside hotel. But this assignment is no stroll along the promenade--N...

Tommy and Tuppence Beresford, the engaging detective duo of N or M? and of By the Pricking of My Thumbs, return in their most chilling adventure. It begins with their discovery of an artfully hidden message: Mary Jordan did not die naturally. It was one of us. I think I know which one. The schoolboy who made this accusation had died long ago, but he and the mysterious Mary Jordan had once lived in the Beresfords' charming old house. And Mary had been...