Alfred Hitchcock and the Three Investigators in The Secret of the Haunted Mirror 

Alfred Hitchcock and the Three Investigators in The Mystery of the Coughing Dragon

The 3 Investigators Crimebusters #1: Hot Wheels

The 3 Investigators Crimebusters #5: An Ear for Danger

The Secret of the Haunted Mirror has some cover wear but is otherwise in good condition; the other three books are in very good condition. The pages and inside of the cover have some age-related yellowing, but The pages of all the books are tight, clean and in good condition.