Celsius Entertainment has picked up world sales rights (excluding Switzerland) to Butterfly Stroke, a Switzerland–U.K. co-production directed by Denis Rabaglia. Principal photography begins July 28, with Judy Davis and Florence Hunt leading a cast that includes Caroline Peters and Malaya Stern Takeda.

Butterfly Stroke follows Ruth (Davis), a former British swimming champion who, after learning she faces a terminal brain tumor, travels to Zurich to seek an assisted-dying protocol. She contacts her estranged granddaughter, Lori (Hunt), to inform her of both her plan and the inheritance she will receive. Refusing to stand by, Lori flies to Switzerland determined to intervene or at least grasp Ruth’s reasoning.

At the clinic, Ruth’s candid approach clashes with the facility’s routines, generating tense—and at times darkly funny—encounters with case managers. Her most rigid opponent proves to be Dr. Steiger (Peters), whose strict adherence to protocol meets Ruth’s irreverent wit.