This book appears to have been written in haste because there are a fair number of errors that wouldn't have happened IMO unless the publication was rushed. Still, not enough to stop me from reading.
When we first met Almamzo, he was 10 and had been left by his family to die. Later, his father had shamed hum further by kidnapping Becky, Paco, and Beaver. When he died in the resulting battle to rescue Becky (Beaver had managed to free himself and Paco, and take Paco for help), Almonzo was taken into Johanna and Rick's family, which now was Rick's 2 nieces and him, and would soon include 2 more girls...which made no difference in how he and Rick's nieces were treated. The nieces were formally adopted, but Almonzo had declined adoption.
Fiona is a maid to Tilly's family, and the only friend Tilly has. Her parents isolate her and they have arranged a marriage to a 50 year old man to their nearly 18 yr. old daughter, for business purposes. Then there is a raid on their camp. The girls had wandered a bit further than usual and it saved their lives. The raiders dressed up as Indians, but were, to the girls, obviously white. They fell asleep while hiding, and woke up in a camp of friendly Indians. They're cared for by a woman with a limp, and with blue eyes, and her 7 year old daughter. They're frightened, but Tilly isn't one for letting her fears be seen. Indians had less oersonal space than Whites of the time, and on top of that, by walking alone to the river to get water to drink, she signalled herself as available to any man. She slaps so many of them that they tie her wrists in self defense (my kinda girl, except I'd have followed the woman's instructions in a culture I knew little to nothing about). They nickname her "Daughter of Fire."
In Portland, there is a nasty white man who believes the only good Indian is a dead Indian, and the only good black is an enslaved or dead black. Oregon was admitted as a free state, but is one that doesn't allow blacks to live there. Of course, Mr. Rich Boots brings his own slaves and gets away with it, paying only a token fine for disobeying 2 parts of Oregon's constitution. But he is plotting something.
Almonzo goes with Paco, Tall Trees, and several other Indians to warn the tribes of possible incoming incursions or raids. They go back after a few days, but in the time during which they're there, Almonzo discovers his ma is living with the Indians, had been badly beaten and nearly dead when they found her, they had done their best to restore her health, she had been married to the chief's son and has a 7 yr old daughter, Mia, to him. He died in a raid and she is a widow. Tillie fascinates him, and he feels an immediate pulll towards her. She convinces him to listen to his mother's side of the story. He finds out his pa wasn't his biological father, his ma was pregnant with him and married him because his biological father died before they could marry. He is able to tell her that the cruel man he had known as his pa has died. Almonzo remembers all the times his ma stepped between him and his pa, taking the beating herself to save him, and realizes the beatings he did receive would have been more frequent and far worse without her. She tells him that, when he was little, she discovered that his adoptive pa had killed his biological pa. When Almonzo was left, beaten and feverish, to die, his mother hadn't tried to help him because his pa had threatened to kill the boy outright if she didn't abandon him as well...and she knew there was a chance the wagon train behind them would find him and he would live. They make up and he meets his little sister.
Meanwhile, Tilly's unwanted fiance breaks off his engagement, which she pretends to be worried about, trying to get more information. Even though both girls were unharmedn and chaperoned, and never touched, her now ex-fiance hints strongly that she should either have stayed with "the savages" or that she should have killed herself since she is "damaged goods."
Jo and Rick have their school, but Rick is unwell, and the fight to keep the schools open to all kids, regardless of income or skin color, is wearing on him. He finally consents to see the doctor, and is diagnosed with a more or less advanced case of dropsy - what we would now call CHF or Congestive Heart Failure. Since he is in his 30s, today, a biopsy of his heart would likely show a viral infection went into his heart and caused a weakening of his heart muscle. With today's medical knowledge, he'd likely have been put in a cardiac rehab program, be given anticoagulants (blood thinners), something to keep his heart pumping more strongly and make sure he didn't have an irregukar heartbeat (they used powdered purple foxglove then - what we now call digitalis), and a diuretic (water pill) to keep swelling down at his ankles and hands and in his belly. He would be evaluated for a heart transplant if warranted. He would weigh himself daily at the same time and report a weight gain of 5 lb or more. I was, most recently, a reaearch and cardiac nurse when I was still able to work as a bedside nurse, plus my mom had had silent heart attacks that weakened her heart so that she had the same thing...and when medications weren't enough to keep her heart rate within normal limits, they placed a pacemaker in her, a single wire one being what was mostly used back then. Rick would have had a 4 wire (1 for each of the heart's 4 chambers) pacemaker with a defibrillator as part of it, that would shock his heart into a normal rhythm if needed. (Old cardiac nurses always keep the beat).
Rick has to stop teaching school, and Johanna wouldn't be eligible to teach, apparently, as she never considers the option. All of the families had deep root cellars to function as food storage but also as hiding places in the event of storms or raids but Rick had made his extend to the barn. This turns put too be a good thing, because something goes badly wrong, and while Rick dies because of it, he dies "with his boots on," defending his family and friends.
There is also a raid on the Indians who took Tilly and Fiona in, and most of the Indians are massacred, and take children with them. While trying to rescue his sister Mia, Almonzo is shot.
Since the federal government won't take testimony from Indians or blacks, Fiona comes up with a scheme. Richard, Tilly's erstwhile fiancé, has died, claiming her father willed all his money to Richard. Richard's "pal," the town's racist agitator, is Fiona's target. She amd Almonzo and a few others help Tilly practice, the sheriff is contacted to listen in on Tilly's act. The man metaphorically hangs himself with his preening and boasting. Tilly also contacts her father's solicitor in San Francisco for more information. Soon, evidence mounts against all the participants in the scheme, even the deputy.
Almanzo's courting methods are so much like my husband's, I had to chuckle. 50 years ago last April 19, my best friend told me he loved me and wanted to know if I could make room in my heart for him (I kinda wanted to shout, "Finally!!!" since I fell in love with him the first time I looked into his eyes about 2 yr earlier, but I didn't). I told him that I already loved him, and he said, "Great! When do you want to get married? Next weekend?" When Almonzo basically asked Tilly to marry him the first time they snogged each other 19th century style, it put me in mind of my own husband. We ended up marrying when he got out of boot camp for the Navy a year and a few months after I told him yes, I wanted to marry him...there were good reasons to delay, but it was very difficult!
For the details of this and all the stuff I didn't mention, you'll have to read the book. As a hint, Sarah causes her father's heart condition to worsen by her actions.