Fair Play (in the original Swedish Rent spel) is a novel by Finnish author Tove Jansson, first published in 1989.

The novel portrays the romantic relationship between two women doing artistic work, Jonna and Mari, who live in separate apartments in the same house (alluding to Jansson's relationship with Tuulikki Peitila).

It is about give and take, compromises and communication, and how the relationship survives even if it changes when the people do.

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