I Thought I Knew You is a gripping psychological thriller that delves into the complexities of friendship, family, and the devastating impact of a shocking allegation.

Who do you know better? Your oldest friend? Or your child?

And who should you believe when one accuses the other of an abhorrent crime?

Jules and Holly have been best friends since university. They tell each other everything, trading revelations and confessions, and sharing both the big moments and the small details of their lives: Holly is the only person who knows about Jules's affair; Jules was there for Holly when her husband died. And their two children – just three years apart – have grown up together.

So when Jules's daughter Saffie makes a serious allegation against Holly's son Saul, neither woman is prepared for the devastating impact this will have on their friendship or their families.

Especially as Holly, in spite of her principles, refuses to believe her son is guilty. In I Thought I Knew You, Penny Hancock masterfully explores themes of trust, truth, and taking sides in a narrative that will keep readers guessing until the very end.