[PAR] [TLE] The Battle of the Labyrinth [SEP] The Battle of the Labyrinth is a 2008 fantasy-adventure novel based on Greek mythology; it is the fourth novel in the "Percy Jackson & the Olympians" series by Rick Riordan.  Percy Jackson, a fictional demigod (who is fifteen years old by the end of the book) attempts to stop Luke Castellan and his army from invading Camp Half-Blood through Daedalus's labyrinth by trying to convince the inventor not to give Ariadne's string to Luke. [PAR] [TLE] Percy Jackson &amp; the Olympians [SEP] Percy Jackson & the Olympians, often shortened to Percy Jackson, is a pentalogy of adventure and mythological fiction books written by American author Rick Riordan, and the first book series in the Camp Half-Blood Chronicles.  Five supplementary books, along with three graphic novels, have also been released.  More than 45 million copies of the books have been sold in more than 35 countries.
[PAR] [TLE] The Battle of the Labyrinth [ SEP ] The Battle of the Labyrinth is a 2008 fantasy - adventure novel based on Greek mythology ; it is the fourth novel in the " Percy Jackson & the Olympians " series by Rick Riordan . Percy Jackson , a fictional demigod ( who is fifteen years old by the end of the book ) attempts to stop Luke Castellan and his army from invading Camp Half - Blood through Daedalus 's labyrinth by trying to convince the inventor not to give Ariadne 's string to Luke . [PAR] [TLE] Percy Jackson & amp ; the Olympians [ SEP ] Percy Jackson & the Olympians , often shortened to Percy Jackson , is a pentalogy of adventure and mythological fiction books written by American author Rick Riordan , and the first book series in the Camp Half - Blood Chronicles . Five supplementary books , along with three graphic novels , have also been released . More than 45 million copies of the books have been sold in more than 35 countries .
The Battle of the Labyrinth is the fourth novel in a pentalogy of adventure and mythological fiction books that have sold more than 45 million copies, and have been sold in how many countries?
The Battle of the Labyrinth is the fourth novel in a pentalogy of adventure and mythological fiction books that have sold more than 45 million copies , and have been sold in how many countries ?
35
35