Moon Gun Sam: The Dolphin - Vow

On Luna, nothing stays buried.

Alexis Klein grew up in a farmhouse that left bruises-not just on her skin, but in the part of her that expected to be abandoned. Her only anchor is Kelli Day, her best friend since they were five, the girl who throws rocks at her when she spirals and holds her hand when she stops.

When Kelli leaves for university on Mars, Alex does the only thing that makes sense: she joins the Moon Guns.

She doesn't expect to find Sam Randolph there-quiet, stubborn, the kind of...