Three independent sisters. Two unclear choices. And one magical wedding dress with a mysterious letter that could change Kenzie MacLellan's life forever.

When a mystical wedding gown transformed her sister's life, Kenzie MacLellan never imagined she'd be next. Now, faced with her own letter and the dress's magic, she's forced to confront a future she never wanted-or believed in.

Fiercely independent Kenzie thrives in her small Vermont town, running her fitness center and living life on her own terms. With her best friend, Robbie Burns, as her constant "plus one," she's never felt the need to date. Why would she when her perfect companion is already by her side?

Honoring Gran's final request, Kenzie reluctantly dons the heirloom dress. The reflection in the mirror leaves her shaken to her core, prompting her to flee to the familiar comfort of the mountains.

Robbie, unbeknownst to Kenzie, has spent years silencing his heart, playing the role of devoted friend and the occasional "borrowed boyfriend." His love for her runs deep, but he's never dared to cross the line.

During their annual hiking trip to the White Mountains, Kenzie falls-but not in the way Robbie had hoped.

For the first time in her life, Kenzie finds herself depending on someone else-and Robbie catches her. His patience and tenderness awaken new feelings as Kenzie's carefully constructed walls begin to crumble.

Suddenly, the line between friendship and love blurs. Kenzie must decide: Is she willing to risk their rock-solid bond for a chance at something more? Will she take the leap from borrowed time to a lifetime of love, or let fear keep her feet firmly on the ground?