David Morrell's book about exploring abandoned buildings
One of the children eludes capture and is befriended by a lady veterinarian and her companion, a former FBI agent. Pretty soon they are on the lam to get away from the bad guys led by the sinister "Uncle Thomas."
I enjoyed this book immensely and would have rated it higher if not for the ineptitude of the bad guys in their pursuit of the good guys. They are highly efficient in eliminating all other people that they consider a threat but make too many obvious mistakes while hunting the good guys.
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