On New Year’s Eve of 2016, instead of being at a party with Anthony, her ex-fiancé, Paris watches Kaden die after finding him injured in his London apartment. She’s left with only a few clues — that Chloe has something to do with it, and two white envelopes she’s seen containing threatening notes signed with the name “Trouble”.
As accusations fly, the tabloids slave over finding the truth, and relationships are put to the test, Paris realizes that Trouble isn't stopping with the death of Kaden, and is desperate to cover up his/her identity at whatever cost. But Paris, to her knowledge, is the only person who knows of the existence of Trouble — marking her, unless she can stop Trouble first.
After all, someone who's already murdered once wouldn't be so averse to doing it again.