When a bookshop goes bankrupt, life is thrown into uncertainty for those who call it home. ‘D’ is eager to win a chance to launch her music career and finally escape her crippling double life. ‘B’ has a fatal secret she keeps from her surrogate children and sets out on a personal quest. While ‘W’ just lets life pass him by as he’s forced to come to grips with his sexuality and the prospect of his father never coming back for him.

This logline presents a scenario with three protagonists in three story threads running in tandem.? The standard logline formula doesn't apply.

What is needed is a logline that ties the story threads together, a unifying theme, dramatic problem, objective goal.? Right now, I don't see what the unifying factor is other than that they all worked at the same place -- but that only applies to the 1st Act.? After that, the characters and their action lines seem to scatter to the wind.

What is the unifying? factor that ties story threads together for the rest of the film?

In its current form this logline lacks most of its necessary components, so it's hard to make any useful suggestions at this stage.
Check out the 'Formula' tab on the top bar to learn more about loglines conventions.

It's fairly SOP in drama that characters have to confront their futures as well as their past.? What's so different about that confrontation in this story? IOW:? what's the story hook?