An awful lot, it turns out, because their third flatmate is neither what nor who she seems.
She too gets more than she's bargained for as the three of them get sucked into the violent volatility of a Middle-Eastern power struggle.
It gets trickier still when the baddies get up close and personal.
Luckily, help is at hand in the shape of a glamorous MI6 agent. Plus, unlikely though it sounds, an astonishingly clever pet rat named Ramona.
They're all on a scarily steep learning curve. And even at the very end one of them is still peering down into the mysteries of her love life.
A cliff-hanger then? You could say that...