Something whistling through the door behind her caused her to turn. A shadow spread across the opening. She clasped a hand to her mouth, stilling the fear that was rising. The menacing shadow was followed by a face that sent a cold shiver down her spine... When the call comes in about Lucy, a seventeen-year-old girl murdered after the secret party she held in her parents' home, Detective Lottie Parker is first on the scene. As Lottie breaks the news to Lucy's heartbroken parents and the devastated partygoers, she discovers that hours before her death Lucy had revealed a terrible secret about her friend Hannah. And when Lottie finds Lucy's bloodstained clothing hidden in Hannah's bedroom, she has no option but to bring her into custody. But Hannah claims to have no memory of the night Lucy died and and as Lottie investigates further, she discovers something shocking. Her own son Sean was at the party. Why did he lie to her? Is her beloved child a witness or a suspect... or in the killer's sights?If you love Karin Slaughter, Robert Dugoni and Rachel Caine, you'll be hooked by this heart-stopping thriller from Patricia Gibney. The Guilty Girl will have you gripped until the very last page.