Break Your Chains by Emily Conolan

To find freedom, you must leave behind everything you've ever known.
It is 1825. You and Ma have survived on the streets of London ever since the soldiers took Da away and you fled Ireland. Now, with Ma gone too, you find yourself facing life-and-death choices at every turn.
Can you carry a secret treasure across the ocean and finally be reunited with Da? You'll be asked to betray your friends, survive storms at sea and attacks by bushrangers, and trust thieves.
At every turn, the choice is yours. How far will you go for freedom?