Tim Wynne-Jones 
Thief in the House of Memory [EPUB ebook] 

It has been six years since sixteen-year-old Dec’s free-spirited mother, Lindy, disappeared. Dec feels so trapped in the present that he has avoided examining his past. But when an intruder dies in the museum-like family home, the man’s death sends forth tremors that reawaken forgotten memories. Suddenly Dec is flooded with visions of his mother so tangible it’s hard to believe they’re not real.At least Dec has his best friend — gifted, funny Ezra — to help him sort out what’s real and what isn’t. But as Dec’s dream visions of his mother turn into nightmares, Ezra announces he’s going away, leaving Dec haunted by questions that must be answered. What did happen to his mother? And who really is the thief in the house of memory?