Mariah plans her upcoming nuptials to James Packer and her first world tour in a decade. Mariah must race the clock to showtime and entrust the tour at the hands of her new manager, Stella.
A grueling tour schedule presents obstacles for Mariah, who does her best to establish a comfortable home base in London for the twins. Meanwhile, two of Mariah's closest friends pull her into the middle of a heated disagreement.
Mariah arrives late to a show due to an unknown time zone change. Stella re-assesses her strategy with the team after a press leak. Stella reluctantly rehires Mariah’s former hairdresser.
Mariah makes special memories for her kids and opens up about her past. Molly disappears in Stella’s time of need. Tanaka lights a match with MC when he jumps out of her anniversary cake.
Mariah spends quality time with her road family in Lake Como, and Tanaka struggles to keep his feelings platonic. Tanaka suffers an unexpected injury that could send him home.
Mariah mourns the loss of her good friend Prince. In other developments, two injured dancers cause Mariah to consider simplifying the show, but Anthony is against the idea. Later, a heartbroken Tanaka realizes his relationship with Mariah was a fantasy.
As the European leg of the world tour concludes, emotions peak, and Mariah is relieved to find out her backup singer and best friend MaryAnne finally has forgiven Anthony, her co-creative director.
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