Where's There's a Will By Jackson Marsh

Will and Jack Merrit are set a simple task: Journey to an island in the Bristol Channel to attend the reading of a will. Why? No-one knows.

Charles Marisco can guess what’s in his father’s will. Everything will go to his twin brother, Simon, because he was born first. However, Charles has other things on his mind, namely, his best friend, Barrett Newton, a man he would like to know more intimately.

A storm-lashed castle, a remote island, and a cast of eccentric characters set the stage for Will and Jack Merrit's most baffling case yet—one that grows deadlier as the body count rises.

This is the fourth book in the Delamere Files series. The books should be read in order.