Madeleine Wickham, a wide-ranging British author who splashed onto bestseller lists as Sophie Kinsella, the pen name she used for her “Shopaholic” series of rom-com books about an overspending fashionista, died Dec. 10. She was 55.

Her death was announced in a post on her Instagram account, which did not share additional details. Ms. Wickham revealed in April 2024 that she was receiving treatment for glioblastoma, an aggressive brain cancer.

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