Silent Alarm — Susan M. Hooper

When their brand new security system fails the test, Helene and Jack Fentnor are awakened by their daughter's screams, instead of the alarm systems' bells and whistles. Racing to her room, the frightened parents find their toddler huddled in one comer of her crib, looking toward a window that should have been shut tight... especially in the middle of a New England winter. Calling on their grown son, Arnie Kotkin, and his partner, Barnaby Moss, for assistance the next day, the Fentnors once again entangle the two young men in solving a crime that turns out to be anything but ordinary.