The Duke Who Knew Too Much by Grace Callaway is a fantastic read. Ms Callaway has delivered a well-written book. I adore the characters, they are phenomenal. Alaric and Emma's story is full of drama, humor, suspense, action and smokin' hot sexy bits. I enjoyed this book and was sorry to come to the end. I look forward to reading more from Grace Callaway in the future. The Duke Who Knew Too Much is book 1 of the Heart Of Enquiry Series but can be read as a standalone. This is a complete book, not a cliff-hanger.