Abby Ellin was shocked to learn that her fiance was leading a secret life. But as she soon discovered, the world is full of people who aren't what they seem.

From Abby Ellin's first date with the commander, she was caught up in a whirlwind. Within six months, he'd proposed and they'd moved in together. But soon, his exotic stories of international espionage began to unravel. Finally, it all became clear: He was lying about who he was.

After leaving him and sharing her story, she was floored to find out that her experience was far from unique. People everywhere, many of them otherwise sharp-witted and self-aware, are being deceived by their loved ones every day.

In Duped, Abby Ellin studies the art and science of lying, talks to people who've had their worlds upended by duplicitous partners, and writes with great openness about her own mistakes. These remarkable stories reveal how often we encounter people whose lives beneath the surface are more improbable than we ever imagined.