If the tribute didn't volunteer

In the ruins of a place once known as North America lies the nation of Panem, a shining Capitol surrounded by twelve outlying districts. Each year, the districts are forced by the Capitol to send one boy and one girl between the ages of twelve and eighteen to participate in the Hunger Games, a brutal and terrifying fight to the death – televised for all of Panem to see.
But this time there is no volunteer. Young Primrose Everdeen has been called up. She has no idea what to expect. With her sister always being by her side, this will be a challenge for her and her family. Once they leave District 12, Prim does not see her sister waving her off.
What will become of Prim whiles in the games, and why was Katniss not at the gates?
Survival starts here for Prim.
Twenty- four are forced to enter. Only the winner survives.