In reading order
He is Watching You
Charlie Gallagher
He Will Kill You
Charlie Gallagher
He Will Find You
Charlie Gallagher
He Knows Your Secrets
Charlie Gallagher
He Will Get You
Charlie Gallagher
The Deadly Houses
Charlie Gallagher
Last One Alive
Charlie Gallagher
The Girl Under the Floor
Charlie Gallagher
The Girls Upstairs
Charlie Gallagher