Cumming delivers a keen-eyed defense of Dutch painting, as a whole, which some art historians have written off as 'just transcriptions of nature,' at best, or 'just depictions of trivial stuff,' when they’re feeling spiteful. Finally, Thunderclap is a memoir, a loving and moving recounting of Cumming’s own love affair with Dutch painting and the importance it’s played in her life, most notably as a connection to her father, the Scottish painter James Cumming.