Stowaway by John David Anderson

When scientists discover a rare and mysterious mineral buried in the Earth's crust, they have no idea that it just happens to be the most valuable substance in the entire universe. It's not long before aliens show up to our little corner of the galaxy...
The aliens offer a promise of protection, some fabulous new technology, and entry into their intergalactic coalition-all in exchange for this precious resource. A material so precious that other alien forces are willing to start a war over it. A war that soon makes its way to Earth.
Leo knows this all too well. His mother was killed in one such attack, and soon after, his father, a Coalition scientist, decides it would be best for them to leave Earth behind. It's on this expedition that their ship is attacked, Leo's father is kidnapped, and Leo and his brother are stranded in the middle of space. The only chance they have is for Leo to stow away on a strange ship of mercenary space pirates...

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