The House on the Cliff — Franklin W. Dixon

In the second novel of the classic children's mystery series, the Hardy Boys must rescue their detective father when he is abducted by smugglers.
 
Always eager for adventure, Frank and Joe Hardy enter a peculiar old house. But after hearing screams, they leave in a hurry. They believe the house is haunted, until they put the pieces of the puzzle together and realize that the house is connected to their father's latest crime investigation. But when their dad goes missing, the Hardy brothers must summon every ounce of their courage to enter the house once more and traverse the twists and turns of its secret passages, where they suspect their father is being held hostage by dangerous drug smugglers . . .