Finn Longman is an author and medievalist, originally from London. They write young adult and adult fiction, with a particular interest in genre-bending stories about identity, friendship, and monstrosity — of the metaphorical or the literal sort. They’ve spent most of their adult life alternating between working in libraries and studying for increasingly niche degrees in medieval literature, and can usually be found in the vicinity of a pile of books.

Finn is currently a PhD student at the University of Cambridge, researching friendship and affection in the late Ulster Cycle.

Finn’s debut YA novel, The Butterfly Assassin, was published by Simon & Schuster in May 2022 with the sequel, The Hummingbird Killer, published in May 2023. The final title in the trilogy, Moth to a Flame, will publish in May 2024.

Praise for The Butterfly Assassin 

‘An immersive, fast-paced thriller’ The Irish Times

‘An electrifying debut!’ Chelsea Pitcher, author of This Lie Will Kill You

‘This dark, enthralling thriller is a compulsive debut’ The Guardian, children’s and teens roundup – the best new picture books and novels

‘An immersive, fast-paced thriller’ The Irish Times, YA Fiction: back to the past in June’s best books for teens

‘A heart-in-your-mouth thriller that grips you from the first page until the very last.’ Benjamin Dean, author of The King is Dead

‘A bold, jagged and uncompromising thriller that will keep you guessing all the way to the end.’ Tom Pollock, author of White Rabbit, Red Wolf

‘Sharp and layered, with a bright beating heart. The Butterfly Assassin will lure you deep into a fascinating and dangerous new world.’ Rory Power, author of Wilder Girls

‘Fierce, thrilling, and impossible to put down. Packed full of amazing friendships, plot twists and a desperate fight to survive’ C. G. Drews, author of The Boy Who Steals Houses

‘An utterly addictive story. I told myself “just one more chapter” well into the night.’ Emily Suvada, author of This Mortal Coil

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