Tatler on Instagram: "#MiaMckennaBruce is stepping into #AgathaChristie’s world of country-house intrigue, roaring twenties glamour, and murder most stylish as a flapper sleuth in Netflix’s #TheSevenDialsMystery. But how well does the It-girl really know the best-selling author responsible for her fate? With the BAFTA-winner gracing Tatler’s February cover, we put her Christie trivia to the test. Click the link in bio for more or find the full story in the new issue, on newsstands 8 January."