"What Abigail Did That Summer" by Ben Aaronovitch is a refreshing novella set in the Rivers of London universe, shifting the spotlight from Peter Grant to his spirited cousin, Abigail. This delightful divergence from the main series follows Abigail through a fateful summer adventure, offering readers a captivating and magical tale.

I thoroughly enjoyed this novella, which showcases Abigail's intelligence, bravery, and unyielding spirit. The story is packed with clever twists, spooky elements, and a rich dose of magic, featuring a troupe of talking foxes, a river god, and other fey creatures. Abigail shines as a ghost hunter, fox whisperer, and all-around troublemaker. She’s not one to sit back and let the world pass her by; instead, she dives headfirst into action, using her wits to navigate and overcome perilous situations.

Abigail’s character is undeniably smart and sensible, yet she possesses a daring streak that leads her to explore places she perhaps shouldn’t. Her courage and resourcefulness are admirable, and she proves to be a formidable protagonist. I especially enjoyed seeing her handle the challenges that came her way, demonstrating both maturity and a youthful exuberance for adventure.

This novella is not only a fun read but also a significant expansion of the Rivers of London universe. It’s a joy to spend time with Abigail, and her narrative brings a fresh perspective to the series. I eagerly anticipate more of her adventures, ideally with her joining Peter and Nightingale at the Folly to further hone her magical abilities.

In essence, "What Abigail Did That Summer" is an entertaining and engaging addition to the series, providing a delightful mix of magic, mystery, and character-driven storytelling. It’s a must-read for fans of the Rivers of London series, as well as anyone who enjoys a well-crafted, whimsical adventure.