Costa Crociere, the largest cruise brand in Europe, is facing a legal and public relations nightmare after seeing two high-profile disasters on its ships barely six weeks apart. Bookings had already dipped by an estimated one-third following the January 13 wreck of its Concordia ocean liner off a Tuscan island that killed up to 32 passengers and crew. The company is blaming that shipwreck on its captain, who stands accused of abandoning ship as passengers struggled to escape.