The Calderan Problem is the fourth high-flying, swashbuckling adventure in the Free-Wrench series from Joseph R. Lallo, author of the Book of Deacon and Big Sigma series.Several months have passed since Nita's last adventure in the fug, and though she has spent them back in her native Caldera, she has never been busier. After countless debates and discussion, she has finally convinced her people to give the Wind Breaker and its crew safe harbor on the shores of her idyllic homeland. Now she is looking forward to introducing Captain Mack, Lil, Coop, and the rest of the crew to the land of her birth.Back in the fug, Gunner has remained behind to help their friends in the Well Diggers deal with problems beneath the fug. Their old foe Lucius P. Alabaster has become even more unhinged and eccentric since their last clash. When his latest scheme seems to be having even greater success than his last, Gunner decides he needs to get to the bottom of it. Flamboyant and overconfident though he may be, Alabaster is not to be taken lightly.As machinations unfold, worlds clash, and relationships develop, the Wind Breaker and its crew discover that this latest adventure may have greater consequences than they'd ever imagined.