Keep It in the Family: Great Service by Great People - John Timpson

In this thrilling novel from bestselling author John Marrs, a young couple's house hides terrible secrets—and not all of them are confined to the past.
Mia and Finn are busy turning a derelict house into their dream home when Mia unexpectedly falls pregnant. But just when they think the house is ready, Mia discovers a shocking message scored into a skirting board: I WILL SAVE THEM FROM THE ATTIC. Following the clue up into the eaves, the couple make a gruesome discovery: their home was once a real-life murder house, with the evidence still concealed within the four walls.
In the wake of their traumatic discovery, the baby arrives and Mia can't shake her fixation with the monstrous crimes that happened right above them. Tormented by the terrible things she saw, she is desperate to dig into the past to find answers.
Secrecy shrouds the mystery of the attic, but when shards of a dark truth start to emerge, Mia realises the danger is terrifyingly present. She is prepared to do anything to protect her family—but will the previous tenants stop her from discovering their secret?