At the shore of Slowdive Bay, grocery store owner Howard rescues Yilly who ventures into the sea, having just broken up with her partner. Thence she spends her days waiting for the rare marine phenomenon called “sea sparkle.” Days turn into weeks and then months for these two strangers, each with their own pasts, trapped in an indefinite wait. Eventually, they will have to decide on a life ahead, and whether to let go of the past.