Rumer Godden is a master of using different tenses for different threads of a narrative (In "China Court", a family history as well as a history of the house that family lived in, she used the present tense in flashbacks to the past, the past tense for the present and sometimes she'd shift to the future tense when she was describing rooms in the house and the events that took place in them, almost as if it were being described from the POV of the house observing the family activities), but I'll admit, it can take a little getting used to.