Failed London banker Max Skinner inherits his uncle's vineyard in Provence, where he spent many childhood holidays. Upon his arrival, he meets a woman from California who tells Max she is his long-lost cousin and that the property is hers.

Tense drama series about the different challenges faced by the British Security Service as they work against the clock to safeguard the nation. The title is a popular colloquialism for spies, and the series follows the work of a group of MI5 officers based at the service's Thames House headquarters, in a highly secure suite of offices known as The Grid.