Wow. This is terrific television.
100% on Rotten Tomatoes for season 1.
The cast is fantastic.

The Tower (season 1) … follows the aftermath of the deaths of a veteran Metropolitan Police officer and a young Libyan girl who fell together from the roof of a London tower block.
When Constable Lizzie Adama—one of the only witnesses—disappears soon afterwards, Sarah Collins‘ investigation becomes two-pronged: what happened on the roof, and finding Adama. …
Click PLAY or watch it on YouTube.
I felt season 2 was equally good. But that season 3 was somehow not up to the quality of the first two.
In fact, it was cancelled after three seasons.
On the other hand, Ella Smith as DC Elaine Lucas is a terrific character. Hilarious.

In any case, this is top notch British television. Recommended.
My biggest complaint is overuse of flashbacks. Weak story telling, in my opinion.