Tangerine by Christine Mangan

Lucy and Alice, the two lead female characters, each take turns narrating this thriller.

A corpse is found in the water at the beginning of the story, which might have something to do with why Lucy and Alice do not get along throughout the novel. The two women each go their own way after a tragedy, only to meet back up in Morocco and continue their less than perfect friendship.

FYI, Tangerine is supposedly in production by George Clooney.  Scarlett Johanssen is scheduled to play a lead role.