Mystery book with orange cover?

Sorry in advance if this isn't the right sub for this.

Last month, I was in the UK and on the trains, airports, etc. they were heavily advertising a murder mystery book that was an orange cover. I recognized the author and went to go buy it but it was massive. Now that I'm home, I would love to find this book to read but I'm going crazy; I swore I added it on GoodReads.

Details: Mystery novel, female author, orange cover, heavily advertised on UK public transports