The complete list

As Sam Holland:

Major Crime series

• The Echo Man (2022, HarperCollins)

• The Twenty (2023, HarperCollins)

• The Puppet Master (2024, HarperCollins)

• The Countdown Killer (2025, HarperCollins)

• The Killer in Room Five (May 2026, HarperCollins)

Detective Theo Wilde (Audible Original)

• Sleeping Beauties (TBC 2026, Audible)

As Louisa Scarr:

Butler and West

• Last Place You Look (Canelo Crime, 2021)

• Under A Dark Cloud (Canelo Crime, 2021)

• Blink of an Eye (Canelo Crime, 2022)

• Seen to be Believed (Canelo Crime, 2022)

• Out of the Ashes (Canelo Crime, 2023)

DC Kate Munro

• Ask Me No Questions (2019, republished Canelo Crime, 2025)

• Nowhere to be Found (2020, republished Canelo Crime, 2025)

PC Lucy Halliday

• Gallows Wood (Canelo Crime, 2024)

• Memorial Park (Canelo Crime, 2025)

• Broken House (Canelo Crime, 2025)

• Leicester Square (Canelo Crime, Oct 2026)

As Louisa de Lange:

• The Dream Wife (Orion, 2018, out of print)