The Witch and The Wizard setting

This book is about a brother and sister named Whitford and Wisteria Allgood, they had the perfect family, friends, school, and just in general a perfect life. Until one night when the government had not just taken them from their lives but ripped everything from them, and on top of that the government had claimed that these two normal kids had Powers like in Harry Potter, that they could cast spells and other things like this. So they sent the brother and sister to a cellar/prison type thing and locked them up inside and never let the two see daylight. Whit and Whisty had not exactly enjoyed their stay at hotel creep out, because not only was it a small room for each of them including no light and one nasty old bathroom to share, they also had to deal with the horrifying guards standing watch over the two dimly lit cells.

Whisty then later decides that being locked up in a horror fun house is no fun at all and tell her brother that they need to leave, and somehow they manage to use their powers which they have never used before to unlock the cell doors. Next to them were those big goofs just sleeping on the job, which made it easier for them to escape. On the way out all they can hear in the long, brick lined walls are the echos of their feet splashing against the water on the floor, until one moment when they hear a loud and frightening roar that sounded like a lion but when they reached the odd sound it was no lion but a huge 3 headed slobbering growling dog. Who had the biggest bright red eyes, with claws that could rip apart anything, and there was no way of getting around this beast, but some how they did.