I have mentioned at other times that I enjoy Dystopian fiction. One series that had me waiting for the next book was The Razorland Trilogy by Ann Aguirre. I'm not really into zombies, but Enclave was zombies with a twist; and I was hooked.
The Razorland Trilogy has people who survived the apocalypse by going underground. When they start to come back to the surface, they find others who survived and will fight for survival. They also found others who survived but have been changed. When you think of zombies, you think of dead people. These people are not dead, but they're more animal than human. But, it's terrifying when they start to learn and organize and it begins to look like war is coming.
So, I thought the trilogy would end after book two, Outpost, and book three, Horde. That is what trilogy means. But, I was surprised, and pleased when book number four came out. Vanguard starts after the war has ended. Our protagonist, Tegan has always been searching for something more. She may get her chance to find it when she signs on to be a ship's doctor. I haven't read this book yet, but I'm looking forward to reacquanting myself with old characters and meeting new.