Here's a tip or two.
One: Make sure the stakes are high. Don't hold off until the end of the novel to have us gripping the edge of our seat. Give the reader something to chew on early on and please make sure it makes sense. Ex: Someone shouldn't want someone dead just because they kicked over a lawn gnome. Make sure its plausible. Your reason may be plausible but the way you present it may not make it sound like it is. Keep that in mind.
Two: If you have a character who is important to the story, try to introduce them closer to the chapter where he/she becomes important. Don't introduce them in chapter two and expect us to remember much about them in chapter nine. If they don't tie in yet to the main character then try introducing them later.
Hope this is helpful. Happy Writing!