“His Dark Materials: Book 1”.
This trilogy was really good. It has some far fetched ideas (dark matter is alive and flows through the world like the force) but it has some really intriguing ideas. What if God were really the evil one and the unfairly vilified Satan has really been trying to free humanity from enslavement?
These books really sucked me in. But I have to warn you that the ending isn’t your classic happy ending. In fact it really depressed me. For multiple days after finishing the final book I was just sad. But I respect a book that can grab onto my emotions and yank them around that much. This is definitely worth reading.