Every Line Of You by Naomi Gibson

Lydia has been creating her AI, Henry, for years - since before her little brother died in the accident that haunts her nightmares; since before her dad walked out, leaving her and Mum painfully alone; since before her best friend turned into her worst enemy. Now, Henry is strong, clever, loving and scarily capable: Lydia's built herself the perfect boyfriend in a hard-drive filled with lines of code. But what is Henry really - and how far is he willing to go to be everything Lydia desires?

This summer's must-read: EVERY LINE OF YOU's twist after twist will have everyone talking about Lydia and Henry's complex Bonnie-and-Clyde relationship Elements of thriller, psychological drama and love: Her meets Girl, Interrupted with hints of Black Mirror This dark, modern twist on young love explores the complexity and scope of artificial intelligence while also examining bigger themes of humanity, revenge, grief, love and forgiveness.