Lockdown is a 2020 mystery thriller by Scottish crime writer Peter May, set against the background of a deadly influenza pandemic.

Detective Inspector Jack MacNeil is ordered to investigate the discovery of fresh human bones found at a building site in Lambeth.

A thumbprint on a London Underground ticket found at the scene takes him along a chain of clues, eventually leading to an empty house in Wandsworth.

Meanwhile, Dr. Amy Wu, a forensic scientist who is in a relationship with MacNeil, determines that the remains are probably those of a girl of about ten years of age, of East Asian origin, and with a harelip.

While preparing to break into the house in Wandsworth, MacNeil encounters Dr. Sara Castelli, an investigator with the Health Protection Agency who believes that the Chinese girl was the source of the pandemic.

An instant messaging chat window that is open on Amy's computer indicates that she has been discussing the case with her mentor, Dr. Samantha Looker.

May wrote Lockdown over six weeks in 2005, but it was rejected by publishers in the UK who thought that the portrayal of London under siege by a flu epidemic was unrealistic.

Shortly after publication, he used part of the advance to donate six iPads to NHS Western Isles for use in its virtual visiting service.