Bonanza - Book 2 - " Star light, Star bright..."
Sarah Cartwright is practicing towards winning the barrel racing contest at the upcoming Virginia City Rodeo, just weeks away, so she can try to get her Pa a real nice birthday present. But, other things are happening, in the background, in her world...
An innocent enough question she asks her Pa, one day, sends them both on a quest to find out if her Ma really DID die, as her Pa was told - or not...
These stories make the most sense when read in their proper order : Book 1, Book 2, etc.