The Silent Fleet: The Messenger, Book 4 (Unabridged‪)‬

As Dash and his team begin expanding the Forge, they must focus on Dark Metal as the one thing that can give them an advantage in the coming war.

Using drones and a map from an ancient library, Dash and Leira must seek out the source of a transmission coming from far away. That source, however, is something far more valuable than they could have hoped: a fleet of ancient Unseen ships, waiting to be salvaged.

With the Golden forces closing in, Dash will need to enlist more help as he prepares to engage the enemy. He must choose his next battleground, all while the Forge works to arm his team with new weapons that could turn the tide once and for all.