Mystery Double Pack Nancy Drew #18 Hardy Boys #17

"(W/A) Various Two books in every pack! Featuring an adventure from both the Hardy Boys and Nancy Drew. In City under the Basement, Nancy and her father Carson are taken prisoner in an ancient city long buried beneath a luxurious estate - and only Nancy can halt the plundering of this living museum and somehow make it out in one piece! In Word Up!, someone has made death threats against a high school talk radio host and it's up to Joe and Frank Hardy to find out who is making these threats and why, risking life and limb to protect his right to say whatever he wants!"