Small screen hits: why we're so fascinated with contract killers

In new shows Killing Eve and Barry, two assassins prove to be compellingly vicious protagonists with a queasy combination of curiosity and repulsionA beautiful woman confidently strides through a chic backyard party on a sun-dappled Italian afternoon. The house is perfect, the festivities are perfect, she’s perfect. Just when it looks like she’s snuck away for a midday dalliance with an older lover, she draws a knife from the tastefully placed chopstick in her hair and stabs the man