Blue paperback crime thriller with red star bookmark

I found a blue paperback crime thriller this afternoon around 2:15pm outside the Winchester Discovery Centre on Jewry Street. The cover is a matte blue with a white title, and the spine is a bit creased. Inside, a red star-shaped bookmark sticks out between pages, and there's a small sticky note tucked in that reads 'Book Club - June.' The book is in decent condition but clearly loved. If this is yours, I’m happy to hold onto it and arrange a handoff near the library entrance.