Omnibus: Sleepyhead & Scaredy Cat - Mark Billingham (Tom Thorne #1 & 2)

Sleepy head - Goodreads 3.83

DI Tom Thorne is up against a gruesome adversary who's killed three victims - but his fourth, although alive, has undergone a deliberately induced stroke. With all her senses are intact, she is unable to move or communicate. This is possibly the killer's first miscalculation... or is it? Thorne (given to distrusting his own abilities) is playing cat-and-mouse with a psychopath who's as interested in leading him a merry dance as he is in fulfilling his degraded obsessions.

Scaredy Cat  - Goodreads 3.95

SCARE SOMEONE ENOUGH, THEY'LL DO ANYTHING...

It was a vicious, calculated murder. The killer selected his victim at Euston station, followed her home on the tube and strangled her to death in front of her child. At the same time, killed in the same way, a second body is discovered at the back of King's Cross station. It is a grisly coincidence that eerily echoes the murder of two other women, stabbed to death months before on the same day...

It is DI Tom Thorne who sees the link and comes to the horrifying conclusion. This is not a serial killer the police are up against. This is two of them. Finding the body used to be the worst part of the job. Not any more. Now each time a body is found, Thorne must live with the knowledge that somewhere out there is a second victim, waiting to be discovered...