Have a go at the activities within the BBC Bitesize link. There is a quiz for children to complete as well.
There is also a Purple Mash quiz to complete too.
Look at the powerpoint at the bottom of the page and how David Almond builds up the tension within his opening.
Watch Mrs Morton complete some shared writing based on the plan that she has created.
Have a go at writing your opening to a mystery story.
Don't go too far with it.