The Emperor of Mars (Secrets of the Dragon Tomb #2) by Patrick Samphire

If Edward thought life was going to be easy in Tharsis City, he was very, very wrong. The moment he intercepts a thief escaping from Lady Harleston’s townhouse, he is caught up in a terrible scheme that threatens the whole of Mars.

Soon he’s fighting off vicious sea serpents, battling a small army of heavily-armored thugs, and trying to unpick an impossible mystery. Meanwhile, Putty has declared war on her new governess, a war that, for the first time in her life, Putty may be in danger of losing.

Edward doesn’t know whom he can trust. Will he make the right choice? Or will his family – and his entire planet – fall victim to the treacherous Emperor of Mars?

Join Edward and his family for a whole new, exciting adventure on Mars