It all started on a Saturday... Aviva is intrigued by the mystery man who keeps showing up at her running group, never speaking to anyone, always trailing behind, always watching her. Milo can’t explain his actions, even to himself, but when he sees Aviva through his apartment window, stretching before her run, he finds it impossible to stay away. She’s like sunshine when the last few years have been so overcast he can't seem to see beyond the clouds. They have an instant physical connection, but Milo sets a firm limit; they can only have Saturdays. Aviva knows she’ll want more; one day a week with Milo is never enough. Can Milo take a chance on love, or will they only ever have Saturdays?