The The Unexpected Quantor: 1 Book 1

When Al ventures into the mysterious Little Treeby Forest he discovers the truth behind the tales of Quantors and the secretive Elequai.  It seems grandad's tales were true and the Elequai, a family of humanoid stones can make the Quantor's thoughts become real. 

With Al's new found powers he begins the search for his best friend Pip's dad, who went missing five years earlier, in an attempt to ease her pain.  Helped by their horses, Stella and Rambo, Al and Pip are pulled into a world of strange happenings and adventurous journeys.

At the same time Al is trying to master his beloved piano and please his magnificent teacher Ms Marble, who has a secret of her own.

Then five Elequai are stolen and Al must find them before the world goes completely mad.  He has to pit his wits against Pinter, an evil Elequai, determined to take over people's minds and rule the world. Al has to learn very quickly to control his imagination before it controls him.

But who has the missing Elequai?  Is it Pinter or are there other forces at work?