This "taut and twisty" thriller by the New York Times–bestselling author "blends cutting-edge surveillance technology with traditional spycraft" (Publishers Weekly).

The spy twins known as Jack and Jill were born into the world of global espionage. Often estranged, always connected by a legacy they can't escape, the siblings have eluded many who want them dead. But now they face a threat unlike anything they've known before.

When a powerful assassin broker dies, the world's deadliest killers are suddenly free to pursue their own vendettas and political agendas. The US government has mobilized its own killers to preemptively hunt down and destroy each potential threat. The most dangerous on the list are Jack and Jill.

As they board a flight to Berlin hoping to meet the father they never knew, they must not only evade US operatives, but also a high-level Russian operation determined to secure their skills. Caught between two superpowers with unlimited resources, brother and sister will match wits against the world in a high-octane chase across Europe. And the only way out may be an unholy alliance that could change the balance of global power forever.