One word can be effective, but ensure it is explosive.Two words can be a little dull. Lots of stories have a two word title and often it's a case of Samuel's Day or Autumn Leaves. A bit uninventive.
If you add a third word, it livens up. So you could have Samuel's Magical Day or Red Autumn Leaves. Or make it much more exciting - Samuel's Final Day or Black Autumn Leaves. These last two are more suggestive and might encourage to read on with more interest.
So remember that titles are vitals.