The solutions to 10 mysteries solved by Leroy "Encyclopedia" Brown are given in a separate section, challenging the reader to match wits with the 10-year-old mastermind of Idaville's war on crime.

"An attempt on the life of the U.S. president during a visit to Manhattan is the first step in a plot involving the recruitment of a network of terrorists, and it is up to Blake Johnson and Sean Dillon to uncover the mastermind behind it all."--from NoveList.

While searching for their missing father, Frank and Joe, the Hardy boys, solve a mystery involving a magician, American secret agents, and international spy ring, and a Scottish castle.

"On a sunny afternoon in late June 1914, Cambridge professor Joseph Reavley learns that his parents have died in an automobile crash. Joseph's brother, an officer in the Intelligence Service, reveals that their father had been en route to London with a mysterious secret document--allegedly possessing the power to disgrace England and destroy the civilized world. Now that explosive paper has vanished, and Joseph is left to wonder: How had it fallen...

A warm-hearted, occasionally meddlesome widow from New Jersey, is hardly anyone's idea of a CIA operative - exactly why Emily Pollifax is so effective as a spy. Called upon to deliver eight expertly forged passports to the Bulgarian Underground, Mrs. Pollifax carries them in her hat, pretending to be a tourist visiting the scenic Balkans. Contact with the Underground might have been routine, but Mrs. Pollifax's habit of interfering - however benighnly...

"A game of canasta turns out crooked, and a golden girl ends up dead. It seems that Auric Goldfinger is a bad loser when it comes to cards. He's also the world's most ruthless and successful gold smuggler. As James Bond follows his trail, he discovers that Goldfinger's real game is the heist of 15 billion dollars of US government bullion. The final hand is played at Fort Knox, in a spectacular display of deception and intrigue."--

"When hackers target locations all over London, Kat leads the City Spies in testing security for the British Museum where a secret message leads them to Egypt and the ancient City of the Dead"--WorldCat.

Gabriel Allon has returned to Umbria with his wife, Chiara, to restore an altarpiece. His world is thrown into turmoil with the news that defector and former Russian intelligence officer Grigori Bulganov, who saved Gabriel's life in Moscow, has vanished from London. British intelligence is sure he was a double agent, but Gabriel knows better. Gabriel and his team find themselves in a deadly duel of nerve and wits with the murderous Russian oligarch...

"In this breakneck, race-against-the-clock thriller, a British spy has twelve hours to deliver her asset across London after Russia hacks the city's security cameras. Can she make it without being spotted... or killed? Nothing about Emma Makepeace is real. Not even her name. A newly-minted secret agent, Emma's barely graduated from basic training when she gets the call for her first major assignment. Eager to serve her country and prove her worth,...

The death of a journalist leads Gabriel Allon to Russia, where he finds that, in terms of spycraft, even he has something to learn. He's playing by Moscow rules now. Ivan Kharkov, a former KGB colonel who built a global investment empire on the rubble of the Soviet Union, is an arms dealer and he is about to deliver Russia's most sophisticated weapons to al- Qaeda. Unless Allon can learn the time and place of the delivery, the world will see the deadliest...