[{title:"book 1",numberOfReaders:3,characters:[[{name:"annie",age:3,height:60,items:{itemName:"watch",itemDesc:"tells time"}},{name:"bob",age:5,height:100,items:{itemName:"sword",itemDesc:"a long metallic sword"}}]]}]

db.collection.find({},{title:1,numberOfReaders:1,"characters.name":1,"characters.items.itemName":1})