The Running Grave

The Running Grave by Robert Galbraith is number 7 in the Cormoran Strike series of crime novels. Private detective Cormoran Strike and his partner Robin Ellacott are involved in a number of cases when they are approached by a father who wants them to remove his son, Will, from a cult in which the son has become involved. Robin decides that she needs to infiltrate the cult, the Universal Humanitarian Church, to try and contact Will to discover what he really wants to do. 

Meanwhile Cormoran and his team attempt to identify and locate former cult members who left the church. It is soon discovered that many of the former cult members died shortly after their release - either apparently by suicide or violent death. However their investigations soon uncover the violent crimes occurring within the cult and the ill treatment and intimidation of members. Robin also discovers how some of the cult beliefs are used to manipulate church members.

J K Rowling (writing as Robert Galbraith) is an excellent writer of suspense novels, making the reader want to  keep reading to discover what happens next. However at 945 pages the book is once again too long.