Somewhere between Monday and Wednesday, a small girl named Wren discovers that her most perfect day — a warm Tuesday full of golden light and the smell of rain-soaked clover — is slowly disappearing from her memory like fog from a mirror. Armed with an empty pickle jar and a determined heart, she sets out to capture the day before it's gone forever, and learns something surprising about why beautiful things are allowed to leave. A cozy, luminous story for anyone who has ever wanted to hold onto a moment just a little bit longer.