Briggs, A: Gravity

The second book in the action-packed Inventory
series.
Hidden under a small suburban town, the Inventory is a collection
of the most incredible technology the world is NOT ready
for.

In this sequel to Iron Fist, much of the Inventory's
technology has fallen into the wrong hands - including Newton's Arrow,
a powerful weapon that can manipulate gravity.

It's up to Dev and his friends to get it back, and they follow
the weapon's trail around the world.

Along the way they learn the terrible truth about Newton's Arrow's
capabilities ... as well as disturbing details about Dev's origins.

THE INVENTORY SERIES OF BOOKS

Iron Fist (book 1)

Gravity (book 2)

Black Knight (book 3)

Winter Storm (book 4)