Haven't read it yet, so no idea how good it is. But hey, it's free ...
http://www.altaro.com/vm-backup/ebooks/ransomware-ebook.php
If you prefer not to give your email address, this direct link should work:
http://www.altaro.com/assets/Altaro_Ransomware_A_Survival_Guide.pdf
http://www.altaro.com/vm-backup/ebooks/ransomware-ebook.php
If you prefer not to give your email address, this direct link should work:
http://www.altaro.com/assets/Altaro_Ransomware_A_Survival_Guide.pdf