As Sciamma's Petite Maman arrives for worldwide streaming on MUBI, on which it's also your last chance to stream a gem of feminist film history, The Heiresses, with Isabelle Huppert, critic Soma Ghosh discusses two films of female friendship. Both are set in rural isolation and tinged with Gothic mystery. This 'Strange Mothers' episode queries how we construct maternal instinct and the drive behind female bonding.