What is the book 'Indian In the Cupboard' about?

The Indian in the Cupboard (1980)The story is About a Boy named Omri, who gets a cupboard from his brother for his birthday, that, if used in conjunction with a key that belonged to his great-grandmother, brings the spirit of historical people forward in time, where they are imposed within plastic toys. Omri brings a plastic Indian figure, given to him by his friend Patrick, to life. The toy turns out to be an Indian of the 1750's called Little Bull (Little Bear in the American version). While Omri is attempting to purchase seeds and small tools for Little Bull to help him survive, Patrick finds out about the magic cupboard. This leads to more trouble, when Patrick brings a cowboy, Boone, into the present. Despite the fights and rivalries between the two tiny men, Patrick refuses to send them back until it is too late. Boone insults Little Bull while they are watching a western movie so Little Bull shoots Boone with an arrow, severely wounding him. Then the key goes missing, which means the boys cannot bring a World War I medic to life to treat Boone, and Omri's brother Gillon's pet rat escapes into the house. Little Bull, Patrick, and Omri manage to recover the key before the little men are lost to the rat's hunger, and Boone is cured

Little Bear is a demanding character, and ultimately Omri must provide him with a bride, Twin Stars (Bright Stars in the American version), with whom Little Bull goes home with to his own time. Before he sends them back through the cupboard (whose magic powers work in reverse as well) he has Boone and Little Bear become blood brothers, despite the obvious animosities between cowboys and Indians. Then Omri sends them back to Little Bull's time.