Author POV,

When Emma picked up her phone and tried to call James, at first it was telling her that the cell phone was out of network....

So, she started thinking that maybe James would be out of the house somewhere, so that's why it is telling this....

But then her eyes went to the clock on the wall in front, so it was 2 o'clock in the night, so she thought that at this time he cannot go out anywhere.....Because it is too late and Emma knew James very well in this matter....

As such, both of them had known each other very well in such a time, then...