(From the publisher):
On a visit to Germany the Hardy brothers investigate the theft of plans for a newly invented submarine and the mysterious disappearance of valuable coins and paintings.
Original title: Submarine Caper
Genre: Fiction→ Crime and Mystery→ Detective Story and Detectives
Fiction→ Children & Young Adult→ Mystery
Fiction→ Children & Young Adult→ Suspense/Thriller
- This book was originally titled Submarine Caper, and then renamed in 1985 as Deadly Chase.