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Browse the Mayhem trilogy by Heather Atkinson in order, with book summaries, series background and notes on how it links into the Dividing Line world.

Last updated: December 23, 2025

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Publication Order

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3 books

1

Poison

by Heather Atkinson

2023

In Poison, Jules “Venom” Parker finds herself trapped between biker club loyalty and her secret ties to both the Maguire and Law families, as her club backs psychopathic Alex Maguire in a gang war that could destroy everyone she loves.

2

Dark Heart

by Heather Atkinson

2021

In Dark Heart, the Mayhem prequel arc deepens as biker Jules “Venom” Parker is drawn further into a deadly feud involving the Maguires, Laws and her own club, exposing just how violent the heart of Manchester’s underworld can be.

3

Venom

by Heather Atkinson

2018

Venom kicks off the Mayhem trilogy, following biker Jules “Venom” Parker of Lucifer’s Shadow as club loyalties pull her into a looming gang war tied to the Maguire family, forcing her to question who she really stands with.

Series background & context

The Mayhem trilogy is a raw, biker-centred prequel to the Dividing Line saga. Set in and around Manchester, it focuses on Jules Parker, better known by her road name Venom, a fearsome member of the one percenter motorcycle club Lucifer’s Shadow. These books show how the Maguire–Law underworld looked before the events of Dividing Line, and how a different kind of family lives by its own brutal code.

Jules has grown up inside the club. The bikers are her brothers, her protection and, often, her prison. When club president Jasper throws Lucifer’s Shadow behind Alex Maguire – an unstable and vicious player in the wider Maguire clan – in a brewing gang war, Jules finds her loyalties under unbearable strain. Supporting the club means siding with a man she knows is poison.

Complicating everything is a secret Jules can tell no one. She is related by blood not just to the Maguires but also to their closest allies, the Laws. That hidden lineage pulls her in two directions at once. She wants to stand with the men who raised her, but she also understands all too well what the Maguires and Laws can do when cornered.

Across Venom, Dark Heart and Poison, Atkinson charts Jules’s struggle to decide who she really is. The violence escalates from street-level showdowns to open war, and every choice she makes has a cost in lives. The trilogy is frank about the appeal of biker brotherhood – the freedom of the road, the fierce sense of belonging – but it never shies away from the misogyny, addiction and bloodshed that come with it.

For readers already invested in the Dividing Line books, Mayhem fills in crucial backstory about figures who later stride through Manchester’s underworld. For newcomers, it offers a self-contained, fast-paced slice of gangland fiction with a tough but painfully human woman at its centre.

Edited by

Richard Reis

Software engineer whose passion for tracking book recommendations from podcasts inspired the creation of MRB.

Anurag Ramdasan

Lead investor at 3one4 Capital whose startup expertise and love for books helped shaped MRB and its growth.

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All 3 Mayhem Books in Order (Complete List 2026)