How does Sade become aware of the dilemmas of human existence once she arrives in London in The Other Side of Truth?

The Other Side of Truth was written by Beverly Naidoo. It is about two Nigerian children who seek refuge in London as refugees after their mother is murdered in Nigeria. Seeking a safe place to stay, they escape the dangerous police and social unrest in Nigeria to try to find a better life. Unfortunately, shortly after arriving in London, they realize that the dilemmas of the real world are not what they expected to experience. For one, London has a colder climate compared to Nigeria, and Sade and Femi, the two Nigerian children, are not prepared for the weather in London. They don't have warm enough clothing.
What's even worse is that Uncle Dele is not around to take care of the children as planned. He has gone missing. So the children essentially become homeless runaways. They become hungry and tired, and the shopkeepers and customers treat them disrespectfully as they try to wait inside the stores to stay out of the cold weather. On one occasion, a homeless man shouts at them and grabs their bag, so they scurry into a shop to protect themselves. While they are inside, a group of boys vandalize the shop. When the boys leave, the children try to escape the shop also, but the shopkeeper stops them. He thinks they were aiding and abetting the group of boys, so he forces them to wait until the police arrive.
The children are distrustful and fearful of all police based on what they witnessed back home in Nigeria. Although they are terrified, the London police do not seem to want to hurt the children. Eventually, the children end up in a foster home. Their foster mother is a white woman, and her home is ugly compared to their beautiful home back in Nigeria, so the children certainly feel like they're not in the right place.
The children also encounter all sorts of other challenges, including harsh mistreatment at the school that they ultimately attend, but the dilemmas of human existence show Sade that perhaps she should have stayed in Nigeria even though it was unsafe. This struggle between a place that is unsafe but familiar and a place that is different but less unstable makes Sade realize that the human experience is not perfect anywhere on Earth, and sometimes people must cope with their environment as best as they can because it is the least problematic situation for them.