JD: Answer "a newspaper."

After solving the RIDDLE, you have finally gained access to the CONTENTS inside the SUITCASE.

Among the CONTENTS are: ONE (1) CRUMPLED SLUETH HAT, ONE (1) FLASHLIGHT, and ONE (1) CRABPLING HOOK [HARD TO SAY ALOUD, DEBATABLY EVEN A CRAB].

This stuff always comes in handy!