I haven't read the novelization, but if anyone who has could chime in here, I'd appreciate it.
When Kylo Ren murders Han Solo, it first appeared to me that he was going to surrender his lightsaber to his father and renounce the Dark Side. I don't think that it was a coincidence that, as this was happening, the last vestiges of light from the sun were snuffed out, his resolve appeared to return, and he then took back the lightsaber and committed the murder.
In the novelization, was he going to give up the Dark Side? Or was he planning to give hope to his father only to dash it, all along?