A heartbreaking and hopeful story that explores grief, mental health, first love, and the cosmic feeling of finding your person -- and yourself, perfect for fans of The Fault in Our Stars and If I Stay.

Sixteen-year-old Ellie has been in mourning for the past year since her twin brother, Jack, died in a car accident. Ellie barely eats or sleeps; her grades have plummeted. Her only comfort is running late at night, under the same stars she once studied with her brother.

Then, on a midnight run, she collides with a mysterious boy she's never seen before but is inexplicably drawn to. Homeschooled most of his life due to illness, Tom is finally healthy and experiencing the wide-open world for the first time. Ellie isn't looking for a boyfriend. She isn't even looking for a friend. But she can't help but feel like the cosmos is pulling them together...until a stunning discovery throws Ellie's universe into chaos.