Audrey and Ivy, determined to bring their fellow student Lola Radcliffe's killer to justice, find themselves in the middle of another mystery when a friend disappears in suspicious circumstances. Their only clue is a mysterious card left by the enigmatic Magpie Society. With time running out and the police baffled, Audrey and Ivy must delve deeper than ever into the dark secrets that their school is hiding.But someone is playing a deadly game. And to beat them, Audrey and Ivy have to start rewriting the rules... Praise for One for Sorrow:'The perfect read for teens' - Glamour UK'A nail-biting page turner written with cinematic sparkle, depth, and a heap of charm.' - Jennifer Niven, #1 bestselling author of All the Bright Places'A thoroughly modern (and deliciously gothic) murder mystery - think Serial at Malory Towers' - Katie Lowe, author of The Furies

Zoe Sugg is a multi-hyphenate businesswoman, content creator and the bestselling author of the Girl Online series. In 2009, she started her blog and social media channels under the name "Zoella" and took the online world by storm. She has amassed 25 million followers across her YouTube and Instagram channels, and regularly uses her platform to address important subjects like mental health, cyber-bullying and women's health.Amy McCulloch is a Chinese-White author, raised in Canada and based in London, England. Amy has been editorial director for Penguin Random House Children's, where she published Zoe's #1 international bestselling series Girl Online, and has written for YA and middle-grade readers in her series The Oathbreaker's Shadow, The Potion Diaries and Jinxed. When she's not writing, she can normally be found on top of a mountain.