Exodus is a science fiction novel written for teens to young adults by Julie Bertagna, published in August 2002.

The story is set on an island faced with the problem of a rising sea level, caused by melting ice caps and other forms of global warming.

Julie Bertagna was inspired to write this book in 1999, when she learned of two South Pacific Islands being engulfed by the sea as a result of global warming, forcing the people to find higher land.

Bertagna started to investigate into the topic of global warming and the stories inspired her to write Exodus and its sequel Zenith.

The Sky Police, from New Mungo, occasionally take the strong up to the city in a procedure called Pickings, but Mara has a bad feeling about this.

When she realises her will to live is too strong, Mara manages, with the help of an urchin she names Wing (after her drowned island), to enter the city gates.

Together, they organise an escape plan that involves David crashing the Noos with a 20th-century virus, allowing Mara to free the slaves and then leave the city unnoticed.

While executing her plan, Mara fatally stabs Tony Rex, a man she believes is a spy, with an ancient bone dagger, and then rescues Gorbals, Wing and all the people chosen in the Pickings, who have become slaves.