Hide and seek - MJ Arlidge

Goodreads 4.28

Prison is no place for a detective

Helen Grace was one of the country's best police investigators. 

Now she's behind bars with the killers she caught.

Framed for murder

She knows there is only way out: 

stay alive until her trial and somehow prove her innocence.

Locked up with a killer

But when a mutilated body is found in the cell next door,

Helen fears her days are numbered. 

A murderer is on the loose. 

And she must find them.

Before she's next . . .