"Doc Dee and Invisible Six go to the Amazon rain forest to find the source of a deadly virus. But bandits and wild animals are the least of I-6's worries when the true enemy is invisible and can't be beat by typical combat." -- Adapted from back cover.

"The US military is under cyberattack. Gizmo and invisible Six must discover who is behind this attack and the culprits' aim. But the mysterious hackers seem one step ahead of I-6 at every turn." -- Adapted from back cover.

"As a tropical cyclone churns across the Pacific, a cargo plane carrying nuclear weapons vanishes in the storm. Bicep and Invisible Six must recover the missiles before they fall into the wrong hands. Their mission takes them to a remote US military outpost in the Pacific. But the base soon comes under attack. Can Bicep and I-6 hold off an invasion long enough for backup to arrive?"--Page [4] of cover.

"Middle school readers will find out about the important world, national, and cultural developments of the decade 1960-1969"--Provided by publisher.

"Middle school readers will find out about the important world, national, and cultural developments of the decade 1940-1949"--Provided by publisher.

"Middle school readers will find out about the important world, national, and cultural developments of the decade 1920-1929"--Provided by publisher.

"Middle school readers will find out about the important world, national, and cultural developments of the decade 1930-1939"--Provided by publisher.

"Middle school readers will find out about the important world, national, and cultural developments of the decade 1990-1999"--Provided by publisher.

Discusses and explains the events of the 1920's and 1930's that led to the outbreak of the Second World War.