Death in the Dark by Bryce Moore

When multiple women are found murdered in their London homes during The Blitz, seventeen-year-old Mary Churchill vows to uncover the identity of the Blackout Ripper, even if it puts her own life at risk. From the author of The Perfect Place to Die and Don't Go to Sleep comes another chilling historical mystery.

Seventeen-year-old Mary Churchill feels helpless as London is ravaged by air raids and mandatory blackouts. As the youngest daughter of the Prime Minister, she longs to do something important, to help those in less fortunate circumstances. On a night out on the town, she connects with an older woman who is in-between jobs and promises to meet her again the next day. Except she never shows up. Mary has a sense that something is wrong, so she decides to go searching-and finds her brutally murdered.

Horrified, Mary immediately goes to the police. But there's a war happening, and they don't have enough manpower to fully dedicate themselves to the murder case. So, Mary takes it upon herself to investigate. The deeper she falls into the case, the more shocking murders she finds. All women, all strangled and mutilated. This is her chance to do something to actually help, to find out who is responsible for the murders and make sure they never have a chance to harm anyone else.

Against the backdrop of bombings and darkness, Mary searches the streets of London for any clues she might ascertain and finds herself in a game of cat-and-mouse with the Blackout Ripper. If only one of them can make it out alive, does Mary have what it takes to make sure its her?