Sue frowned.  "We can lock down the controls for the low berths."  She turned to the control console for the devices, turning it off so that the berths could not have their setting changed without first having a control code input.  "That handles that.  And these things have a dedicated power supply.  We can lock the hatches to the room."<br/><br/>She frowned slowly.  "None of which will keep out a determined murderer."  Then she turned back to Katie.  "Any ideas?"<br/><br/>A few moments later, she shook her head.  "Did he say anything to you before I got there?"<br/><br/>Finally, she added, "You know the passengers better than anyone else.  Do you have a suspect for this?"