Yeah. Actually, that was the story of my writing life for a long time. My mom, who hasn't read anything I've written in ages, always replies the same way when I mention that I'm working on a novel that I aim to publish: "Don't forget to have a plot!" Thanks, Mom.
I love characters... but for so long I was afraid to torture them. They had flaws, and they had plenty of bad stuff in their respective pasts, but I never allowed any of that to come to a head in the present. I believed too hard in the mantra that character IS plot -- well, it is, but there's still gotta be something that propels the reader to turn pages.
Do your characters have conflicts with each other? That creates suspense right there. Same with something from a character's backstory that comes back to haunt him or her in the present. I suspect you have the seeds of a plot in your novel already, heyjude.
Last night I stayed up way too late reading a mostly plotless novel I wrote several years ago. I got a full 60,000 words into that one before realizing I didn't know where it was going. But when I reread it last night I kept turning the pages (well, scrolling through the pages) because it really felt like it was building to something. It never did, of course, but if I ever decide to rewrite that novel I know to cut that first 60,000 words of buildup to about 10,000 words and then start making life harder for my characters.