Our pick of highlights from December's auctions

Get caught up in Tomás Saraceno’s webs at the Palais de Tokyo and listen to Sophie Calle’s dead cat tribute featuring Bono and Pharrell Williams

Tis the season for Old Masters: here are three works to seek out, from a mythological marriage portrait to Annibale Carracci's sketch on an old account book

Gaurav Bhatia is co-operating in "formal enquiry" ahead of auction house’s inaugural sale in Mumbai today

From Thomas Gainsborough's family portraits—including his pet dogs—at the National Portrait Gallery to "sexual warfare" at Goldsmiths CCA

From the treasures of an Assyrian king at the British Museum to Lorenzo Lotto’s insightful portraits at the National Gallery

The off-beat artist will re-envision the exterior of the historic building

Bita Vakilli's work was withheld for a week by government officials

Two works supposedly owned by bankrupt company, whose director Matthew Green resigned in February following FBI sting operation, are "apparently" in Dubai