I’m reading a Kindle book about writing page-turner/suspense tales at the moment (I’m not reading about genres at random… there’s a reason for it All will be explained soon, and it’ll make sense). I’ll definitely use what I’m learning!
Suspense can be in the mystery genre, though there are differences. This book describes those differences, including my favorite quote from the legendary Alfred Hitchcock (a bomb is in a bag below a table with two people. We know, but they don’t).
My current novel plans have elements of the paranormal, romance, comedy and suspense (I don’t believe in being pigeon-holed into a single category). This is advice that I’ll use for future novels too.