The most expensive mystery of all

The whereabouts of the "Salvator Mundi", the most costly artwork in the world, are still uncertain, as is its attribution to Leonardo da Vinci. Federico Varese, best known for his studies of the mafia, follows the trail; the TLS's history editor David Horspool considers the inner and outer worlds of Anne Frank’s diary, the actual anniversary of the Peterloo massacre, and a selection of other contributions to this week's special issue; Ladee Hubbard reflects on the late Toni Morrison, who died last week, and considers 'The Pieces I Am', a documentary that highlights Morrison's multifaceted life, work and legacy


The Collected Works, by Anne Frank, translated by Nancy Forest-Flier, Susan Massotty, Mirjam Pressler and Kirsten Warner and edited by Mirjam Pressler

Peterloo: The English uprising by Robert Poole

Legacy: One family, a cup of tea and the company that took on the world, by Thomas Harding

The Pieces I Am, by Timothy Greenfield-Sanders

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