Laurence Shames: Florida Straits (USA 1993)
From the Publisher:
Suddenly, everyone's after Joey - including the ruthless Miami don who wants his three million worth of uncut emeralds and who just dispatched his goons to deliver Joey a one-way ticket - out. Now Joey's where he always wanted to be - in the big time. All he has to do is find out where the stones are stashed. And for an unikely hero out to make a killing, this could be Paradise... if he lives long enough.
Laurence Shames: Florida Straits. Dell, ISBN: 0440215110 (June, 1993), 368 S., $6.50.