10 Best Books by Kristen Callihan Kristen Callihan is an author of romance novels. 10 Best Books Written by Kristen Callihan 1. The Hook Up The Hook Up is a 2014 book by Kristen Callihan. Buy on Amazon 2. The Friend Zone The Friend Zone is a 2015 book by Kristen Callihan. Buy on Amazon 3. Idol Idol is a 2016 book by Kristen Callihan. Buy on Amazon 4. Managed Managed is a 2016 book by Kristen Callihan. Buy on Amazon 5. The Game Plan The Game Plan is a 2015 book by Kristen Callihan. Buy on Amazon 6. Dear Enemy Dear Enemy is a 2020 book by Kristen Callihan. Buy on Amazon 7. Make It Sweet Make It Sweet is a 2021 book by Kristen Callihan. Buy on Amazon 8. The Hot Shot The Hot Shot is a 2017 book by Kristen Callihan. Buy on Amazon 9. Fall Fall is a 2018 book by Kristen Callihan. Buy on Amazon 10. Exposed Exposed is a 2021 book by Kristen Callihan. Buy on Amazon