Important thing to know for comic order for anyone interested in something is killing the children series
The series uses volumes that contain 5 issues and the classic omnibus format
For anyone about to purchase book 1 and 2 which serve as omnibuses
Book 1 contains 1-15
Book 2 contains 21-35
You may have noticed the issue there, you need volume 4 which includes 16-20
I’m guessing they did that because 16-20 could be considered a prequel. But honestly there is so much important information in these issues I would consider them a necessary read. Mainly because they add a large amount of context to how the world works and the MCS backstory
So reading order for first 35 issues and than the rest of the series
Book one
Volume 4
Book 2 ( you get to issue 35 here
Than volumes 5-9
After that the rest are volumes go by 5, with the last being volume 9 that holds issues 41-45 or you can hold out until they make book 3, but that might be a while as volume 11 is still set to come out later this year. But personally that’s what I’m doing, I love having a big chunk and a good hard cover
For anyone who got curious by the name and solely clicked for that purpose
I would describe the series as a more horror focused Buffy the vampire slayer with a great main character. The name is not just to grab your attention. The series is brutal but done well. I highly recommend it especially if you are a horror fan or a hellboy fan and can stomach gore