Gaudi Afternoon (2001)

Cassandra, a solitary writer in Barcelona (a US ex-pat) gets a call for help from a stranger - a stylish woman named Frankie - who wants Cassandra to find her husband, so he can sign some important papers. Nothing Frankie says is true: the husband turns out to be a woman, the issue isn't legal papers but a child's custody, and even Frankie's most obvious identity, in red cape and red pumps, is a false front. But Cassandra keeps at it, at first to earn her promised fee, and then to help Frankie, then Frankie's ex, then the child. Along the way, this solitary and somewhat disconnected and bewildered writer frees herself to finish a novel and re-establish a broken relationship.