The 20-year battle over a painting by Camille Pissarro that a Nazi art appraiser stole from a Jewish woman fleeing Germany will see argument in the US Supreme Court on 18 January, on whether the lower appeals court used faulty reasoning when it chose the law to apply to the claim. On 15 December, the Thyssen-Bornemisza Collection Foundation (TBF) of Spain filed its brief disagreeing with the claimants, who say the California federal appeals court chose the wrong “choice of law” rule. The question, a paradise of complexities for procedural law experts, lets the Supreme Court further clarify the rules...