Book 1: Mission Titanic
Quiz Number: 172670
Reading level: 4.5
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Doublecross Series
Book 2: Mission Hindenburg
Quiz Number: 175412
Reading level: 5.5
Book 3: Mission Hurricane
Quiz Number: 179763
Reading level: 5.9
Book 4: Mission Atomic
Quiz Number: 183139
Reading level: 4.5
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